Originally Posted by danjamesjr
How can I tell which generation? I know I've looked at obd port and from what most diagrams say to jump a and b pins to enter diagnostic mode. Well, those pins are not next to each other and completely different.
TPS sensor = 5 volts?
EGR test? The car has a non vacuum powered EGR it'* electronic.
Ehh, not looking forward to taking intake manifold off lol.
Testing with light seems good but doesn't measure if injector is clogged only dead? Does light dim if clogged?
How do you tell a Gen II 3.1 for a Gen III? Look at the upper intake manifold. If it looks like a 1988-1994 style, it;* a Gen II, if it looks like a 1995 to 2002 style it'* a Gen III.
Gen 2 engines are more prone to injector fails.
Either style removing the upper intake is required to access the fuel injectors.
The Test light is connected to the wiring harness on the engine, to check for signal from the ECM to the fuel injectors. Rare on those cars yet 1 out of 1000 might have that issue.
The Injector is checked with a Muilti-Meter on the OHMs Setting. Injectors have to fall between two spec to be acceptable. Injectors not in spec will NEVER fire. GEN II 2.8L & 3.1L engines will often not run at all if one is bad. They will not run at all if two go bad. It'* been a good 8 years since the last one of these I did.
There is a test procedure for Electronic EGR valve. I did it once 10 years ago and don't recall it. Common problem much like 4.3 V6 astro van: carbon chunks hold the pintle open when it should be closed. Others fail in the open position. This allows exhaust gas in to the intake stream at times it should not be entering. This effects the mixture and the ECM freaks out trying to compensate for an issue it can not,.