is it my maf for corvette 86-87 that it cause this problem????

My car run with very very lean fuel mixture.


What are the possible cause????

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trans-am 89 3.27 posi 5.7 l98 700r4 with dual exhaust stock

[This message has been edited by stallone (edited June 19, 2001).]

[This message has been edited by stallone (edited June 19, 2001).]

 

Highly unlikely. Check the TPS, and replace the fuel filter if you havent already.

 

What is your fuel pressure at idle with the vacuum line off & plugged?

 

madmax--->my fuel filter is new. How can tps have inluence with very very lean fuel mixture??

whitroc--->me fuel pressure is at 45 psi. So, i dont know with the vacuum line off. Why is it necessary to check fuel pressure without vacuum??

And, what about my maf. Can it be the reason of all my problems about very lean fuel mixture.

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trans-am gta 89 t-top
3.27 posi
5.7 l98
700r4
dual cat
stock

[This message has been edited by stallone (edited June 20, 2001).]

 

ttt

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trans-am gta 89 t-top
3.27 posi
5.7 l98
700r4
dual cat
stock


[This message has been edited by stallone (edited June 21, 2001).]

 

Stallone,
I don't think the MAF would cause this problem. The MAF wouldn't limit your rpms at a certain range and it would give you a real rough idle.
And I don't really know what your problem is BUT I had a simular problem on my car that I could not get above 4000 rpms. The problem was blown head gaskets between the two middle cylinders on both heads!!!
The only way I found this was I did a cylinder pressure test on each cylinder, not a fun task! the middle two cyclinders showed only 50 - 70 psi, not a good thing!
So I'm not saying it is this but you may want to check this out.

Good Luck!

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89 IROC 350 Auto
Custom DUAL Exhaust
Edelbrock Performer 6085 Aluminum Heads
ZZ9 Cam
TPIS Level 5 Chip
And Free mods.

Moderator of http://www.iroczone.com

Member of JFA Crew

 

my car wouldnt turn over 3500 and the problem was the catalytic converters stopped up

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92 z28 170,000 miles 14.20 on goodyear eagles before exhaust only mods k&n and slp 13/4 headers and dual 2 1/2 exhaust
87 trans am 12.20 on motor too many mods to list