[Aggie 90GT]

Just wondering if anyone here knows what might cause my car to run lean. Here is what ive tried/replaced so far:

O2 sensors
IAB
EGR
Fuel Filter
MAF
Intake Manifold (found a crack in it)
Smog Pump
All the gaskets
...and ive had a shop in CS and in Houston search for Vaccumm leaks and both have found nothing.

I just changed the MAF and i really thought that was going to fix it, and right now im just super stumped.

If anyone has any ideas please let me know.

thanks

Swisher


PS: Houston Performance already told me my problem was the lack of a Big Block...but i think ill stick to the stock 302 for a little longer...

[97CasperCobra]

If no one here can give you any leads, try posting this over on corral.net. I've found them to be the most "technical" forum out there. Good luck man.

[Nosreplive]

You might want to post this up in the "tech" section ... We have some pretty informative guys there. Not to mention a couple mechanics ....

Infact I'm gonna move this to that section......

[bighoss88lx]

My 88 is doing the same thing and the first things that im going to try are the CTS and the IAC sensors. They play a pretty big role in the A/F ratio.

[Aggie 90GT]

I checked out my IAB and it appears to be working fine. I havent checked my CTS, and if im guessing correct thats the Coolant Temperature Sender right? Another wierd thing is when the weather gets colder my car has a little more trouble starting up in the mornings. Could these two things be related?


PS: Nosreplive, thanks for the move.

[dcm4136]

My car started running lean. I put a 255 lph fuel pump and an adjustable fpr in it. No more lean for me.

[bighoss88lx]

Mine has the same starting problem when its cold out. CTS is the coolant temp sensor on top of the heater bypass rail. Also I am talking about the IAC, intake air charge sensor located on the driver side front lower intake. That will be the first thing I will replace. But im sure all of it has something to do with each other, esp if its temp related. Have you tried scanning your codes to see if you have any sensors out of range?

[dcm4136]

Autozone will scan for codes for free.

its probably your fuel pump and AIB. make sure the U is turned so the air blows right through it.
the sensor is on the #5 runner

[SilverSnake]

Ok just to correct you guys it is not CTS it is actually
ECT engine coolant temperature sensor and it will cause cold starting problems, most common symptom and does affect air
/fuel ratio. The ACT air cooled temp sensor does not have an affect on a/f ratio. Your most common componnet for a/f ratio
is the MAF. Check your fuel pressure it should be 30 to 35 psi with vacum 40 to 42 with out vacum , if problem is lean at higher
RPM's fuel volume maybe the concern. and also check igntion timing depending on your aplication. Just some suggestions:jeff:

[Aggie 90GT]

My fuel pump is only a year and half old, and the only codes im pulling are left O2 sensor lean and right O2 sensor lean. I checked my fuel pressure and it checked ok and the shop in Houston checked it for me when they replaced my intake manifold and they mentioned that it was fine. As soon as I get paid im going to look into replacing my ECT and see if that helps any. thanks for the info SilverSnake.

Swisher