New to the forum.Long time reader first time posting sorry if this is the wrong place for this post.
I have a 95 GP se 3100 with an intermittent miss that just keeps getting more common.Miss is like a 3/4 race cam idles.It can come and go,kill the motor at any speed,refuse to restart for 15 min or fire back up and purr.Only constant is it only dose it when the engine is at operating temp after driving more than 4 miles.
what I have tried;
replace comp temp sensor
installed after market fan controller set to 210deg.(Since found Corroded control wire was caused inconstant fans)
Swapped coil from gtp
new plugs and wires
good spark all 6
replace fuel pump and filter (pressure was a little low)
cat vacuum tested and not excessively hot
EGR tested and new seal
Map tested ok
O2 sensor voltage ok
clean throttle body twice
throttle position ok
compression ok and balanced
So everything tested good,,,,when I tested it....I have little to no experience with OBD1.5.but can I trust its diagnosis?The service engine light has never turned on.No light = no codes.No code means the computer can't see the problem.There fore I can eliminate everything the computer is monitoring as being intermittently bad.The monitoring list is the same as OBD1? I am down to position sensor or ignition mod fail when warm with road vibration but (correct me if wrong) that will turn on the SEL.
Thanks for making it this far in a long post and any help is appreciated.Thanks in advance.I was told by members of grand prix forum you guys were men with the answers!Don't make them liars! lol