94 z26 running terrible

[twistedretta]

3100 v6 230,000 miles has bad throtle response and no power that cat glows red I cut it off no change all six plugs soaked in gas I changed them they get covered again it has good compression and 40psi of fuel at rail I changed plugs,wires,coilpacks,fpr,fuel filter injectors im lost im thinking timing jumped a tooth idk please help

[berettaboi]

unbolt the exhaust before the cat and see if that helps flow? clogged cat? pretty unlikely it jumped timing, but it is possible... any idea when a new timing chain(if ever done) was put on?

[twistedretta]

The exhaust is off already and I bought it with high,miles s Ooo idk if timing was ever done

[berettaboi]

exhaust is disconnected before the cat? may want to get a timing light on it and see what going on in that case... or get a 3400 ready... lol

[twistedretta]

Yea the exhaust is off before the cat and im looking for a timing light I was alalso thinking maybe knock sensor idk

[Koots]

It's running super rich, which would lead me to CTS or knock sensors, if you've got the cats removed.

[twistedretta]

Cts? Whats that crank trigger sensor? Lol where is it located

[3X00-Modified]

coolant temp sensor

Also turn the key on let the pump prime, do not start it and check the fuel pressure. if its not holding and dropping off quick then you have a bad FPR leaking through the vac line, or you have a stuck open injector.

You could also have a bad ignition system causing multiple cylinder misfires which then results in excess un-burnt fuel on the plugs.

[twistedretta]

Yes the key is on car not running for 40psi at rail. Im gonna change cts knock sensor etc today ill post if it fixes it thanks for the help

[3X00-Modified]

knock sensor will not cause these issues, save yourself the time. I drove to Chicago with mine unplugged due to false KR issues.

[Koots]

knock sensor will not cause these issues, save yourself the time. I drove to Chicago with mine unplugged due to false KR issues.

Good to know.

The OBD-I systems still don't make a lot of sense to me. I'm more familiar with all mechanical engines or OBD-II full computer control

[twistedretta]

I changed cts and tps still no change anyone please help I really need this car running good

[twistedretta]

It smells like there is fuel in the oil??

[spacecadetz26]

02 sensor?

[3X00-Modified]

You have a rich condition... You need to check everything fuel related as well as ignition and SCAN the ecu to see what the sensors are reading to pinpoint this. Without data it's just sensor after sensor that we will suggest.

I'm guessing bad ICM resulting in multiple cylinder misfires which is dumping fuel in the exhaust glowing the cat as well as polluting the oil with fuel because it's washing the cylinders with it.