Replaced an intake gasket and now rough idle / running rich IDEAS?
#1
Replaced an intake gasket and now rough idle / running rich IDEAS?
Hey guys I have a 89 GTA which ran like a perfect purring kitten, but the intake was leaking a tad so we pulled the intake off and replaced the gasket.
The intake leak was not into the oil just leaking on the top of the intake.
Now all put back together and carruns really rich and idles really rough.
I have sprayed the TPI and intake area with WD-40 and Ether thinking possibly a vacuum leak but does not change idel at all (Like a vac leak would when hit with ether.
So wondering if anyone has any ideas on what to check for, I have changed the mass air flow sensor ($150) YIPES and no change, I don't want to toss money hand over fist chasing a bug.
I want to make sure is clear it ran LIKE A TOP prior to changing the intake so I hae to think is a vac line or something in the wiring upon putting back together.
Any info or input would be great!
Thanks in advance
Pete
The intake leak was not into the oil just leaking on the top of the intake.
Now all put back together and carruns really rich and idles really rough.
I have sprayed the TPI and intake area with WD-40 and Ether thinking possibly a vacuum leak but does not change idel at all (Like a vac leak would when hit with ether.
So wondering if anyone has any ideas on what to check for, I have changed the mass air flow sensor ($150) YIPES and no change, I don't want to toss money hand over fist chasing a bug.
I want to make sure is clear it ran LIKE A TOP prior to changing the intake so I hae to think is a vac line or something in the wiring upon putting back together.
Any info or input would be great!
Thanks in advance
Pete
#3
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Car: 89 iroc
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Re: Replaced an intake gasket and now rough idle / running rich IDEAS?
Hey guys I have a 89 GTA which ran like a perfect purring kitten, but the intake was leaking a tad so we pulled the intake off and replaced the gasket.
The intake leak was not into the oil just leaking on the top of the intake.
Now all put back together and carruns really rich and idles really rough.
I have sprayed the TPI and intake area with WD-40 and Ether thinking possibly a vacuum leak but does not change idel at all (Like a vac leak would when hit with ether.
So wondering if anyone has any ideas on what to check for, I have changed the mass air flow sensor ($150) YIPES and no change, I don't want to toss money hand over fist chasing a bug.
I want to make sure is clear it ran LIKE A TOP prior to changing the intake so I hae to think is a vac line or something in the wiring upon putting back together.
Any info or input would be great!
Thanks in advance
Pete
The intake leak was not into the oil just leaking on the top of the intake.
Now all put back together and carruns really rich and idles really rough.
I have sprayed the TPI and intake area with WD-40 and Ether thinking possibly a vacuum leak but does not change idel at all (Like a vac leak would when hit with ether.
So wondering if anyone has any ideas on what to check for, I have changed the mass air flow sensor ($150) YIPES and no change, I don't want to toss money hand over fist chasing a bug.
I want to make sure is clear it ran LIKE A TOP prior to changing the intake so I hae to think is a vac line or something in the wiring upon putting back together.
Any info or input would be great!
Thanks in advance
Pete
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Re: Replaced an intake gasket and now rough idle / running rich IDEAS?
What's your vacuum at idle?
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Re: Replaced an intake gasket and now rough idle / running rich IDEAS?
I agree, sounds like vacumn. My car was idling wrong and the vacumn checked good. Turned out to be a cracked plastic vacumn line going to the heater/AC dashboard controls. That was the lne I was disconnecting to check vacumn, so it checked good but was leaking when reattached. Those plastic lines run under the plenum as well, so check them too.
#7
Re: Replaced an intake gasket and now rough idle / running rich IDEAS?
Thanks for the info so far guys, was apart for about 5 hours so don't think would have time to ryst.
Been chasing through Vac lines to no avail yet
Been chasing through Vac lines to no avail yet
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Re: Replaced an intake gasket and now rough idle / running rich IDEAS?
Did you try plugging the intake vacuumn ports? The only one that you really need for trouble shooting is the fuel pressure regulator, the rest can be plugged. Dont forget PCV and power brake hoses.
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Car: 89 iroc
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Re: Replaced an intake gasket and now rough idle / running rich IDEAS?
one more thought.. the left and right side lower runner gaskets are different, if you put the wrong one on the wrong side there will be a vac leak, get some propane and check with a plumbers torch// don't lite it, just let the vac leak suck in the propane,, it will race up when you find the leak
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Car: 91 Purple Z28
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Re: Replaced an intake gasket and now rough idle / running rich IDEAS?
possible coolant temp sensor not reading right? cheap fix if it is
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Re: Replaced an intake gasket and now rough idle / running rich IDEAS?
I had my intake gaskets changed also, same problems
you have. I put a nb o2 senser in the other side and
everything went back to 128 blk learn.
you have. I put a nb o2 senser in the other side and
everything went back to 128 blk learn.
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