Help me from limping around!
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by TUNED87vette
I tried looking up the codes with no luck. I don't know where a listing might be.
I also have these books:
"GM 1987 Corvette Service Manual"
"GM 1987 Corvette Electrical Diagnosis Service Manual Supplement"
Any help on diagnosis is appreciated.
I also have these books:
"GM 1987 Corvette Service Manual"
"GM 1987 Corvette Electrical Diagnosis Service Manual Supplement"
Any help on diagnosis is appreciated.
RACE ON!!!
Thread Starter
Instructor
Joined: Mar 2006
Posts: 216
Likes: 0
From: Palo Alto California
Originally Posted by CFI-EFI
The FSM has the info for looking up the codes. It also has trouble shooting charts for tracking down and diagnosing the cause of various codes, including your code 34. Time spent with your books can save you time and money, under the hood.
RACE ON!!!
RACE ON!!!
Anyone have ideas about the cat?
Melting Slicks
Joined: Aug 2003
Posts: 3,394
Likes: 393
From: Lakeville MI
Why look any further than the MAF?
Get an ALDL datalog with a scan tool when the problem is present. If the MAF is bad, you will see it in the raw MAF data as a noisy or erratic signal, or signal drop out.
Unfortunately, its not a cheap fix with replacement MAFs running between $170-$400 depending upon which one you get.
The Micro-tech MAF is one option and is relatively cheap at around $220 new, but it has some calibration issues that I described in another thread.
Good luck.
Get an ALDL datalog with a scan tool when the problem is present. If the MAF is bad, you will see it in the raw MAF data as a noisy or erratic signal, or signal drop out.
Unfortunately, its not a cheap fix with replacement MAFs running between $170-$400 depending upon which one you get.
The Micro-tech MAF is one option and is relatively cheap at around $220 new, but it has some calibration issues that I described in another thread.
Good luck.
Thread Starter
Instructor
Joined: Mar 2006
Posts: 216
Likes: 0
From: Palo Alto California
Is it possible that my heads cause the low idle? I have never seen a car as low as 14.
Also, the fuel pressure bounces a tiny bit (3psi), where most cars seem to be very steady, but i don't know if that's a real problem.
I don't know if the MAF is bad, so I see no reason to replace it just yet. I may actually be able to borrow a MAF to test if that seems like it could be the problem. Is 1989 the same MAF as 1987?
Also, the fuel pressure bounces a tiny bit (3psi), where most cars seem to be very steady, but i don't know if that's a real problem.
I don't know if the MAF is bad, so I see no reason to replace it just yet. I may actually be able to borrow a MAF to test if that seems like it could be the problem. Is 1989 the same MAF as 1987?
Thread Starter
Instructor
Joined: Mar 2006
Posts: 216
Likes: 0
From: Palo Alto California
Just remembered that I had posted this up a while ago. I know these forums wouldn't function without answers to the questions.
The fuel pump relay was the problem. When pulled out, it was totally burned on the connectors. There was also a vacuum leak that was causing it to stall and act funny. Couldn't find it because it was behind the battery.
The fuel pump relay was the problem. When pulled out, it was totally burned on the connectors. There was also a vacuum leak that was causing it to stall and act funny. Couldn't find it because it was behind the battery.
Le Mans Master
Joined: Oct 2003
Posts: 6,130
Likes: 2
From: seattle WA
Good find 
more guys need to take a look at the FP relay wiring, it's a very common problem on our earlier C4s, and it's all to often over looked when trying to track down a MAF code problem. 
more guys need to take a look at the FP relay wiring, it's a very common problem on our earlier C4s, and it's all to often over looked when trying to track down a MAF code problem.
