I have been enjoying this forum for a little over a month now and have learned a lot of new tricks. I was hoping that someone would have some advice for me on my problem. I have an 88 35th anniversary but have had one very annoying problem that I have not been able to solve.

The car has a sever ping even under light throttle, most of the time I can never make it to full throttle in fear of what might happen. I have exhausted every possible I can think that would be causing this. The car is basically stock. No trouble codes are ever set and on a blue moon the car will drive great but normally in the morning.

1. Fuel Pressure - Good, checked while driving, no drop.
2. Ignition - full tune up, cap rotor, wires, plugs, distributor gear.
3. Knock sensor - Replaced
4. ESC - Substituted a different one, no change
5. EGR valve - was bad, replaced.
6. All possible vacuum leaks checked and repaired.
7. Two ground locations cleaned, block and transmission.
8. Timing chain - replaced
9. Different gas and octane - no difference
10. Exhaust pressure - acceptable 1p.s.i.
11. Throttle position sensor - checked with analog ohmmeter, smooth no dead spots.
12. Injectors - all 14 - 16 ohms.


That is a short list of things I have addressed in an attempt to solve this problem. One thing that concerns me but I do not have another car to compare it to is; when at an idle and you manually move the throttle position sensor I would expect the car to flood and die, this one does not the RPM simply raises about 1000. On an 85 Z28 I had with TPI if you barley touched that sensor you would hear the injectors speed up and the car would die. Is it possible that the injectors are bad I'm a little gun shy to go out and spend the money for new injectors until I can prove they are the problem.

This is a great forum and thanks for any help you can give. :confused: :confused: :confused:

 

Ehthan1321, Just curious did you replace the harmonic balancer, If not and it looks old maybe the rubber has allowed some slipping, if that is the case your timing is going to be way off, I would time it by ear and see if the pinging goes away. :cheers:

 

I did check that when I replaced the timing chain. With the timing gears set at top dead center, I put the balancer on and it was pointing at zero.

I appreciate the suggestion. I would love to get this figured out it's driving me crazy.

 

OOPS, I just noticed you replaced the T-chain. :cheers: