1986 IROC with a 350tpi...
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
1986 IROC with a 350tpi...
All of the smog equipment was left in place except it's missing hoses things are disconnected it's missing the belt for the air pump and it's also missing the cat I'm having a high-flow cat put on it but how do I hook up all of the other emission controls since I need them to pass my smog test in Arizona now here's my question does anybody have a diagram for a 5.7 L engine in a 1986 IROC
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Ok.ty. now the previous owner put headman headers on it,will I be able to run all something special I need to do
#4
Re: 1986 IROC with a 350tpi...
I don’t think there was a 350 offered in 86 in the f body.
If you post up the letters on the computer chip I can identify it for you.
I’m guessing it might be for a 305 still. The 305 uses 19#hr injectors and a 350 uses 22#hr injectors. If you do t have a custom tune already you might be running rich.
You can use 88-89 computer chip in your ecm.
If you post up the letters on the computer chip I can identify it for you.
I’m guessing it might be for a 305 still. The 305 uses 19#hr injectors and a 350 uses 22#hr injectors. If you do t have a custom tune already you might be running rich.
You can use 88-89 computer chip in your ecm.
#5
Re: 1986 IROC with a 350tpi...
https://www.thirdgen.org/forums/cool...-what-fan.html
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
The guy I bought it from said they put a 350 TPI in it 5.7 l but all the smogging and everything is off and yes it is running rich you can smell the exhaust. The other part is all the smogging and everything is disconnected I need to reconnect because where I live in Arizona 1986 you still have to have an emissions test
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
As far as the ECM goes I think you might be correct because when I turn the power on my RPM gauge pegs out none of the other gauges read except for the fuel gauge miles per hour gauge is an 85 mile per hour gauge so it's off on speed and my oil pressure pegs out at 60 sometimes it drops down halfway but there's a lot of problems with this car it's just that it's my dream car and it's a labor of love at this point so I need as much information as I can get about the ECM and also where to find it and how to hook up all the smog stuff so that I can pass the smog and drive legally
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#8
Re: 1986 IROC with a 350tpi...
This is a basic idea of how the air pump is plumbed. There is a crossover for the air pump line that connects both exhaust manifolds/header air pipes. If your headers don’t have air tubes I’m not sure you can pass a visual inspection if the do that.to identify the injectors to see if they are from a 350 they will have a number or number and letters on there body.
#9
Re: 1986 IROC with a 350tpi...
Sounds like you have a broken tachometer.
This guy fixes and sells circuit boards to resolve your tach issue.
https://www.thirdgen.org/forums/engi...-sale-all.html
This guy fixes and sells circuit boards to resolve your tach issue.
https://www.thirdgen.org/forums/engi...-sale-all.html
#10
Re: 1986 IROC with a 350tpi...
The computer is under the passengers side dash under the dash speaker. There is a bracket the ecm is held in that’s bolted to the dash frame.You remove the ecm from under the dash. Once dropped down you can remove the center access cover. You should see a blue chip that has 4 letters on a silver sticker. Unless someone has changed it to a aftermarket memcal.
You might need to disconnect the ecm plugs. To do this press down the connectors latch and pull the connector. I would disconnect the battery first.
You might need to disconnect the ecm plugs. To do this press down the connectors latch and pull the connector. I would disconnect the battery first.
Last edited by Tuned Performance; 01-31-2018 at 03:10 PM.
#11
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
I don’t think there was a 350 offered in 86 in the f body.
If you post up the letters on the computer chip I can identify it for you.
I’m guessing it might be for a 305 still. The 305 uses 19#hr injectors and a 350 uses 22#hr injectors. If you do t have a custom tune already you might be running rich.
You can use 88-89 computer chip in your ecm.
If you post up the letters on the computer chip I can identify it for you.
I’m guessing it might be for a 305 still. The 305 uses 19#hr injectors and a 350 uses 22#hr injectors. If you do t have a custom tune already you might be running rich.
You can use 88-89 computer chip in your ecm.
#12
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
This is how it looked when I pulled it out wasn't even bolted in
#13
Re: 1986 IROC with a 350tpi...
The Hypertech has a number on it to identify its usage .
If you rock back the white and blue tabs next to the memcal it will pop out. If your careful you can release the memcals cover it has tabs on each end. The tabs break easily.
To reinsert the memcal it has a notch in the bottom center this notch matches the notch in the ecm header.
If you rock back the white and blue tabs next to the memcal it will pop out. If your careful you can release the memcals cover it has tabs on each end. The tabs break easily.
To reinsert the memcal it has a notch in the bottom center this notch matches the notch in the ecm header.
Last edited by Tuned Performance; 02-01-2018 at 11:55 AM.
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Ok. I will post a pic. Did you see the post where I sent a pic about the fuel injector?
#15
Re: 1986 IROC with a 350tpi...
Im wondering if you have a 305 or a 350.The block is behind the drivers side head would let you know. if you have leaking injectors. I’d think it would be running lean with 19#hr injectors. Any check engine lights present ?Or if the engine is rich after it’s warm but not too bad cold startup a o2 sensor. The o2 must get to 5-600f to become active this can be a problem in headers without a heated o2.
http://www.chevyhardcore.com/news/re...sting-numbers/
http://www.chevyhardcore.com/news/re...sting-numbers/
Last edited by Tuned Performance; 02-01-2018 at 01:07 PM. Reason: Additional information
#16
Re: 1986 IROC with a 350tpi...
You should be running lean and have some other issue.
https://www.obd-codes.com/faq/read-g...codes-free.php
Last edited by Tuned Performance; 02-01-2018 at 12:30 PM.
#17
Re: 1986 IROC with a 350tpi...
Does it say 156332 on the If it does it’s for a 305
http://www.jegs.com/i/Hypertech/533/156332/10002/-1
http://www.jegs.com/i/Hypertech/533/156332/10002/-1
Last edited by Tuned Performance; 02-01-2018 at 01:29 PM. Reason: Link
#18
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
[QUOTE=irocrocks1234;6198773]Ok. I will post a pic. Did you see the post where I sent a pic about the fuel injector?
pulled Hypertech chip out.. PN: 156332
SN: 626853...
pulled Hypertech chip out.. PN: 156332
SN: 626853...
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Checked numbers on passenger side behind the alternator and I found some numbers on the Block and some numbers on the head I will try to post those so somebody can tell me if they mean anything
#20
Re: 1986 IROC with a 350tpi...
Clh suffix if for a 76 or 73 350 or a 91 305, the block number behind the drivers side cylinder head will help identify the block .
From a truck or vette or camaro
http://nastyz28.com/gm-chevy-codes/c...s-suffix-2.php
http://www.chevy-camaro.com/chevy-ca...es.asp?group=2
http://www.nastyz28.com/chevy-engine-code-stampings.php
From a truck or vette or camaro
http://nastyz28.com/gm-chevy-codes/c...s-suffix-2.php
http://www.chevy-camaro.com/chevy-ca...es.asp?group=2
http://www.nastyz28.com/chevy-engine-code-stampings.php
Last edited by Tuned Performance; 02-01-2018 at 05:02 PM.
#21
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Thank you so much for that link the only thing is is there's three of the CHL codes on there one is from a 1991 305 lb 9 with TBI I'm kind of leaning toward that since I do have TBI but when I bought the car the guy said it was a 350 and so is there any other numbers that I can look at on the engine block to see what this actually is?also what does a small numbers mean underneath the big ones that I sent. And numbers on the head?
#22
Re: 1986 IROC with a 350tpi...
Lb9 is tpi, l03 is tbi .you could pull a valve cover to get the head numbers. The lb9 has 081 heads and centerbolt valve covers. The best way to identify what you have is with the block number on the block behind the drivers side head.
The small number underneath the suffix is the last numbers of the vin vehicle identification number the engine came from.
The small number underneath the suffix is the last numbers of the vin vehicle identification number the engine came from.
Last edited by Tuned Performance; 02-01-2018 at 05:20 PM.
#23
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Okay thank you you're helping me out so much you have no idea. The Hypertech chip that I sent you pictures of and also posted the number part number and serial number of the chip itself what is up with that could you make anything from it?.
#'s on head mean nothing
#'s on head mean nothing
#26
Re: 1986 IROC with a 350tpi...
I don’t have image for 86 tpi air pump.
It will look a lot like this carb air system image.
I have also included 88 image which uses a different air pump mounting bracket but the pipes should look close.
You might be able to find the parts you need bye posting a ad in the wanted classifieds section here. I think the brackets and parts are the same for 85-87 tpi .
It will look a lot like this carb air system image.
I have also included 88 image which uses a different air pump mounting bracket but the pipes should look close.
You might be able to find the parts you need bye posting a ad in the wanted classifieds section here. I think the brackets and parts are the same for 85-87 tpi .
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Test results
What they said to check
Also what to check
What they said to check
Also what to check
#29
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Re: 1986 IROC with a 350tpi...
The guy I bought it from said they put a 350 TPI in it 5.7 l but all the smogging and everything is off and yes it is running rich you can smell the exhaust. The other part is all the smogging and everything is disconnected I need to reconnect because where I live in Arizona 1986 you still have to have an emissions test
Last edited by Beater79TA; 02-03-2018 at 09:12 PM.
#32
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
There is a connector for that peace and yeah we you and I discussed the 305 part of it and the suffix code which I believe is SGU or SGH or something like that I believe this is off of a 91 IROC or Camaro or Z28 or something like that because you sent me a link with the codes on it. So for the electrical connector for the oil pressure switch would that be why my oil pressure gauge shoots all the way up to 60 and stays there as soon as you turn the key on?
#33
Re: 1986 IROC with a 350tpi...
The oil pressure switch is a backup for the fuel pump if the relay fails. The sender for your gauge is on the same oil pressure t or above the oil filter .
Looks like the engine was made in 90 but used in a 91 z28. There wasn’t a iroc in 91. In my opinion the engine is better than the 86 it has a roller camshaft.
Looks like the engine was made in 90 but used in a 91 z28. There wasn’t a iroc in 91. In my opinion the engine is better than the 86 it has a roller camshaft.
Last edited by Tuned Performance; 02-04-2018 at 01:21 PM.
#34
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Ok... well it was unplugged... also is there any way to find out what the F290 means? Here is better pic of 5.0 pic
#35
Re: 1986 IROC with a 350tpi...
I’m guessing the second week of February 1990 just guessing. I’m not sure where to find out this information. I think the block number is on the side of the block visiable from below. Anyways you know you have a 305 not 350 like the seller said
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Ok. Do you know what the SGI means under 5.0? the heads are from a 91. According to list.
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Block number on driver side or pass side? And what is the difference between what came in this and the roller cam this has Now? More power? Better milage?
#39
Re: 1986 IROC with a 350tpi...
The block number might be on the passengers side or the ending numbers on the side of the block. 86 lb9 has 190 hp 285 tq, 91 lb9 was rated at 205 hp 285 tq.
The cam will provide less friction and smoother idle.
The cam will provide less friction and smoother idle.
Last edited by Tuned Performance; 02-04-2018 at 02:20 PM. Reason: Typo
#41
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
Passenger side block 627
A.I.R tube .. only one... arent thier to be two?
What is it? Driver side front by radiator below head lights.
#42
Re: 1986 IROC with a 350tpi...
The vacuum bulb is for cruise control. The air tube welded on your exhaust use to connect to the cat.
https://www.thirdgen.org/forums/tech...seem-find.html
The engine number is likely 14093627
https://www.thirdgen.org/forums/tech...seem-find.html
The engine number is likely 14093627
Last edited by Tuned Performance; 02-04-2018 at 04:58 PM.
#43
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
The vacuum bulb is for cruise control. The air tube welded on your exhaust use to connect to the cat.
https://www.thirdgen.org/forums/tech...seem-find.html
The engine number is likely 14093627
https://www.thirdgen.org/forums/tech...seem-find.html
The engine number is likely 14093627
Broke this damn line... what is it and will it cause car to run bad?
#44
Re: 1986 IROC with a 350tpi...
That is the egr solonoid vacuum line. You won’t notice is running poorly it’s ported vacuum but you should repair it using a 5/32 vacuum line. It tunes from underneath the throttlebody to the solonoid from the solonoid to the egr.
Your kinda beating a dead horse with the engine block numbers since you know it’s a 305.if your trying to find the rear end ratio the rpo codes are in the center console. Or if you service the reared you can see the pinion/ring gear numbers on the ring gear.
http://www.chevy-camaro.com/chevy-ca....asp?year=1986
Your kinda beating a dead horse with the engine block numbers since you know it’s a 305.if your trying to find the rear end ratio the rpo codes are in the center console. Or if you service the reared you can see the pinion/ring gear numbers on the ring gear.
http://www.chevy-camaro.com/chevy-ca....asp?year=1986
Last edited by Tuned Performance; 02-04-2018 at 05:26 PM. Reason: Spid rpo link added
#45
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
That is the egr solonoid vacuum line. You won’t notice is running poorly it’s ported vacuum but you should repair it using a 5/32 vacuum line. It tunes from underneath the throttlebody to the solonoid from the solonoid to the egr.
Your kinda beating a dead horse with the engine block numbers since you know it’s a 305.if your trying to find the rear end ratio the pro codes are in the center console. Or if you service the reared you can see the pinion/ring gear numbers on the ring gear.
Your kinda beating a dead horse with the engine block numbers since you know it’s a 305.if your trying to find the rear end ratio the pro codes are in the center console. Or if you service the reared you can see the pinion/ring gear numbers on the ring gear.
#46
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
Re: 1986 IROC with a 350tpi...
That is the egr solonoid vacuum line. You won’t notice is running poorly it’s ported vacuum but you should repair it using a 5/32 vacuum line. It tunes from underneath the throttlebody to the solonoid from the solonoid to the egr.
Your kinda beating a dead horse with the engine block numbers since you know it’s a 305.if your trying to find the rear end ratio the rpo codes are in the center console. Or if you service the reared you can see the pinion/ring gear numbers on the ring gear.
http://www.chevy-camaro.com/chevy-ca....asp?year=1986
Your kinda beating a dead horse with the engine block numbers since you know it’s a 305.if your trying to find the rear end ratio the rpo codes are in the center console. Or if you service the reared you can see the pinion/ring gear numbers on the ring gear.
http://www.chevy-camaro.com/chevy-ca....asp?year=1986
#47
Re: 1986 IROC with a 350tpi...
The passengers side manifold is missing a spacer on the outlet.
I’m not sure if a shop can adapt them or if the need to build a new y pipe.
Sounds like you can pass without air system I’d get a cat figure out your running rich condition and take it in to be sniffed.
I’m not sure if a shop can adapt them or if the need to build a new y pipe.
Sounds like you can pass without air system I’d get a cat figure out your running rich condition and take it in to be sniffed.
Last edited by Tuned Performance; 02-06-2018 at 06:13 PM.
#48
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Car: 1986 IROC.(RPO B4Z)
Engine: 305 TPI
Transmission: 700r4
#50
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Car: 1986 IROC.(RPO B4Z)
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Transmission: 700r4
Re: 1986 IROC with a 350tpi...
The passengers side manifold is missing a spacer on the outlet.
I’m not sure if a shop can adapt them or if the need to build a new y pipe.
Sounds like you can pass without air system I’d get a cat figure out your running rich condition and take it in to be sniffed.
I’m not sure if a shop can adapt them or if the need to build a new y pipe.
Sounds like you can pass without air system I’d get a cat figure out your running rich condition and take it in to be sniffed.