Tremo

Guys, car is an 88 IROC with LB9. The injector on #3 cylinder may be going south. It misfires at idle but seems to start working again above about 2000 rpm. Everything else has been checked, plug, wire, vacuum, compression, etc.

Car is in the shop and they are trying to clean the injectors hoping that will fix the problem on number 3.

If that does not work and that injector has to be replaced, how long labor wise should it take? Does the plenum have to come off?

Thank you.

2012sergen11

iTrader: (1)

The plenum and runners have to come off the intake to be able to get the fuel rail off. I recently pulled my fuel rail to fix it and it took a couple hours of work to pull it down and reassemble but it was my first time doing it.

Tremo

Thanks man. The shop told me is about 4 hours labor.

ULTM8Z

Sounds reasonable...

UltRoadWarrior9

You might want to consider having the shop replacing all 8 injectors at the same time, lest you be charged 4hrs each time one of your old injectors go bad...

thtanner

iTrader: (1)

Is it really a 4 hour job? I swapped my FPR in under an hour start to finish, so I figure injectors can't be more than 2 hours total?

Not counting shop "book" hours.

truckerz

iTrader: (2)

No way that is 4 hours. I'd limp it home, order a replacement set of bosch 3 injectors from fuel injector connection or southbay.... wait the 2 or 3 days shipping..... Then pull the upper plenum and runners off. Bleed the fuel pressure out of the Schrader valve, unscrew the fuel lines at the front of the block and remove the 4 fuel rail bolts that attach the rails to the lower manifold base. Remove the rail and injectors. Clean the rail up, and follow the instructions that come in your new set of injectors.

The injectors are better and cheaper than the stockers, and you won't be out the approximate 300$ in labor.

You will probably save yourself 400-500 bucks and have the satisfaction of completing the job yourself!

luvofjah

iTrader: (2)

Southbay Fuel Injectors is a sponsor here too, I have their set and Adjustable Fuel Pressure Regulator, so does my neighbor, newer design, they are a little louder than stock, but cars run great with them... Not sure if they still do 5% thirdgen discount still though...

2012sergen11

iTrader: (1)

I would also suggest doing the injector swap yourself, as I said it took me a couple hours working in the driveway the first time I did it so you could save the labor and replace whole set once with the saved money.

I would also recommend if you go that route to do the FPR while the plenum is off I found that out the hard way...because I have to pull mine down again

luvofjah

iTrader: (2)

Southbay sells all the gaskets too, pretty much all you need mailed right to your door...

southbay08

yes, we still have the promo code on most injectors and products. Discount for tgo members is 10%. Just use tg11 at checkout on our website or you can always give us a shout at the shop. 16-442-4707

ploegi

This.

All the injectors live in the same environment. If one is going bad, its a pretty safe bet the rest are not far behind. Replace them ALL.

You could save yourself a couple hundred bucks doing it yourself. (enough to offset the cost of eight injectors, and a adjustable FPR?? Maybe) It's not that bad of a job, if you have a warm place to work.

SbFormula

https://www.fuelinjectorconnection.c...-19lb-set.html

"WE HAVE MODIFIED OUR MOUNTS SO THEY FIT EXACTLY AS ORIGINAL. OUR COMPETITORS ARE 1/4" SHORTER."


Set of 8 Bosh III. That worked well for me. Great company, very helpful. Your car will run richer as the modern injectors are more efficient. I had to pull off the table in Power Enrichment & at idle (tuning). Also check your spark plugs and O2 sensor to make sure they are not toasted by rich/lean condition from incorrect injector metering. Had to change mine as they were carbonized by rich condition from bad injectors. Removing the old gaskets on the runners can be labour intensive. Watch for not gouging the plenum, runner and intake surfaces.

...And yes, after 28 years they are done guaranteed, especially if Multec type.


Best of luck!

rusty vango

really ??!! i need to replace my injectors as well . but i DO NOT want anything that is not drop in and go . tuning ?? not set up for it . and wont be . so the question is ,, if i install a set of bosch 3s . on a completely stock engine , and dont "tune" will they work ? whats all this richer than stock ?? that would be a buzz kill for sure. not to mention a deal breaker . someone please chime in , for i will be ordering injectors soon , and dont want to waste the $300 on something that will be running rich , or otherwise in correct

southbay08

You should be able to install and go as long as you are replacing with the stock flow rate

Tremo

Guys thanks for the tips. Sadly I live in an apartment and have no place I can do this work myself. Not sure I have all the tools needed either.

truckerz

iTrader: (2)

If you can stand around your front end, you have the room.

If I'm not mistaken, all you need is a 3/8 drive ratchet, a set of t-bits (15 bucks or so at home depot) for the plenum and runner bolts a few 3/8 drive extensions, a size 10 wrench for the fuel rail hold down bolts, a size 14 or 15 and 18 or 19 wrench (can't remember off the top of my head the exact size) wrenches for the fuel line connectors.

Basically, a basic wrench and socket set and the torx bits are all you need.

South Bay is amazing by the way. I've ordered injectors from them a couple years ago. They fit perfectly. If you have questions on fitment and application, call them. They are an excellent vendor here. They even have the tpi gasket set.

SbFormula

Sorry! Did not mean to get you confused. The spark plugs and O2 sensor carbonized were from the old injectors Multec that were toasted. I was saying you should check them in case your old injectors did the same mess. When I said you will run richer, it should not be a problem in closed loop as your ecm will compensate. I have tested an datalogged extensively with the new injectors and they are more efficient at low BPW, means less lag time reaction so to speak. You could be richer in open loop at start up but again it would not be a big issue unless you are OCD like me. I revisited my archived and I did not have to touch anything at WOT (Power enrichment), so I guess I should have done my homework before blowing my horn!

Tremo

Any of you guys know a good shop on the Sacramento area who can do this work? Most shops look up the labor hours in some database and it says 4 hours so that's what they charge.

thtanner

iTrader: (1)

I just finished this up, and it did actually take me around 4 hours due to roadblocks and hurdles. The fuel line did not want to cooperate so I had to do it with the line still attached and the rails floating. After all was said and done, the car started 100x better.

As far as shops up north, I'd post in the various Facebook groups (Central Cal Third Gen and Nor Cal Third Gen) as they're very active in those areas.

vinny R

How did you know you had an injector going bad. I have been having start, idle, engine surging, I have thought it might be injector related. I have been through all the sensors and vacum already.