Tonycar107

Long story short. Car has 140000 on original engine. It's an 05 Mt, no cat, new plugs, wires, coils. Im sure the engine is on its last leg. I run torque on a tablet mounted in the dash so I watched it happen. After a short drive to the bank I parked at work and was idling for a bit when my afr went really rich and my stft went to - 25. It began to stall. So I gave it some gas and it went away. A minute later it did it again and I gassed it a bit and everything went back to normal. This isn't the first time it's happened, but it only happens on shorts trip. It will die if I don't apply any gas, but it will start right up afterwards. Could this simply be from loss of compression? I'm not going to bother with a test. Once it goes I'm going to pull the motor and get a reman. Anyone else ever seen this. I tried searching the forum and I haven't found anything. Thank you.

dannobre

iTrader: (3)

Sounds like you have other issues to me. If it was compression it usually wouldn't restart that well when it is warm.
Only way you can tell for sure though is a comp test...otherwise just guessing

Might have a sticky injector?

Usually if it misses it thinks it is lean...so would try and add fuel not -25 trim it.

Tonycar107

I kinda thinking leaking injector. Since it sits for a week at a time now, the initial start takes awhile. Almost like it's flooded but not quite as bad.

MikeTyson8MyKids

iTrader: (1)

What's the front wideband reading? I had a similar issue where I had random stalling and issues in cruise (anytime it was in closed loop). Give it a blip of throttle, goes open loops...runs great. Wideband was clipping high and low when I monitored it via Torque. Replaced it and fixed.

Tonycar107

When I looked, right when it started to die it was 13.2:1 range. It happened quick so it may have richer than that.

Loki

iTrader: (1)

It's not compression. If it were you wouldn't be able to restart it warm with ease.

Pull the spark plugs and see if one rotor is sooty.if both are, the issue is no single injector and likely another system common to both rotors. If one is sooty, that rotor's injectors are likely the issue.

How old are ignition coils and spark plugs?

Could certainly be the O2 sensor has gone crazy but 13.2 is still a reasonable reading. I'd blame injectors first assuming the car isn't overheating and there are no other problems with ignition, etc

Tonycar107

The ignition system is all oem and only has 3000 miles on it. It's not overheating. I put a low speed fan switch in it so the temp barely ever goes over 206. This weekend I'll pull the plugs. I'll post some pictures if they look strange. I'm going drive it for the rest of week too.

Tonycar107

Well, I got the flu and have been home trying not to die. So the logical thing to do was pull my plugs. Front plugs look like new. Rear rotor not so much. Definitely had coolant on them. Just a couple drops but definitely not gas. Im thinking this is my problem. Its pretty much 100° here in south Florida for the next 5 months. I'm going to wait to pull the motor until it cools down a little.