hankosolder2 Posted August 25, 2011 Share Posted August 25, 2011 Hey guys, I don't mean to be asking a question a day here, but... My wife reported that her '98 OBW ('95 EJ22 swapped, 5MT. 216K) was lurching and stalling. No CEL is on. I started the car from cold and drove it down the alley. Under light throttle in 2nd, it cut out briefly (not a cylinder misfire- complete loss of power on all cyls.) It also stalled on take off a couple of times (seems like it's going to launch normally, then it's like someone just clicked the key to off.) It will restart easily and then sometimes do it again. It cleared up and ran perfectly the rest of the day. Next day, it ran fine. Today I drove it for 45 min, it ran fine. Shut it off for 5 min, restarted, car briefly bogged at about 3/4 throttle at speed. Later cold started the car, took a short trip and the car once had an abrupt near stall while idling. (This is unusual- the problem almost always seems to happen under load with the car moving) Borrowed a scan gauge II. The car stalled badly two times after a cold start under acceleration. By the time I had the scan gauge set up properly, it was too late to get useful readings. Monitored the CTS, TPS, bat voltage and open/closed loop readings on the way home. Is it normal for the car to go open loop on moderate acceleration? For some reason, I thought that was only supposed to happen near WOT. Anyway, I'd be open to any suggestions. It's so intermittent it's driving me nuts! MAF sensor? Plugs are NGK, OEM plug wires, probably 5 years old and not a ton of miles on 'em. Nathan Link to comment Share on other sites More sharing options...
smackvt Posted August 25, 2011 Share Posted August 25, 2011 prob the pump try an giv it a alternet fule suply while cracken the thotle Link to comment Share on other sites More sharing options...
Fairtax4me Posted August 25, 2011 Share Posted August 25, 2011 Is it normal for the car to go open loop on moderate acceleration? I thought it had to be WOT for it to switch back to open loop. (I certainly could be wrong though) Does the TPS signal indicate WOT when this happens? Link to comment Share on other sites More sharing options...
hankosolder2 Posted August 25, 2011 Author Share Posted August 25, 2011 I thought it had to be WOT for it to switch back to open loop. (I certainly could be wrong though) Does the TPS signal indicate WOT when this happens? No, it doesn't. The TPS reading is usually around 25 when it happens. My code scanner seems kind of sluggish with reading out the data, so it's possible a small glitch could come and go without the display updating in time to reveal it though. It also goes open loop on coasting/ decel fuel cut, but I think that's normal. Nathan Link to comment Share on other sites More sharing options...
jboymechanic Posted August 25, 2011 Share Posted August 25, 2011 When it's idling (if you can get it to) tap on the MAF and see if the engine runs worse or stalls. Tom (TheLoyale) just had a similar problem on his '95 Legacy and that's how he found it was the MAF. Some times the car ran fine, other times it was getting too much fuel and choking itself out. Can you smell excessive fuel or notice a significant drop in fuel economy? Link to comment Share on other sites More sharing options...
hankosolder2 Posted August 25, 2011 Author Share Posted August 25, 2011 OK, I tapped on the MAF- it didn't seem to make the slightest difference at idle and didn't change the readings on the scan gauge. Link to comment Share on other sites More sharing options...
danbennett2u Posted August 25, 2011 Share Posted August 25, 2011 I would go with the easiest and cheapest thing I can think of first and replace the fuel filter first. Link to comment Share on other sites More sharing options...
hankosolder2 Posted August 26, 2011 Author Share Posted August 26, 2011 I don't think a fuel filter could possibly be intermittent, but I've been wrong about "X failure mode couldn't possibly cause...." before. Nathan Link to comment Share on other sites More sharing options...
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