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Old 08-13-2008, 08:41 PM
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Engine flooding

Not exactly a hotrod question but a fellow called me a little while ago with a problem he has with a 1989 Plymouth Acclaim 2.5 4 banger with a TBI system that is running extremely rich. He said it will not pull up any codes when he had it scanned but it is obviously running a very rich mixture. The garage he had it to replaced the air filter and spark plugs and it ran fine for about 200 miles but now the plugs are sooty black and fouled out again. They told him it was probably a bad sensor (did not say what sensor) and without a code they would just have to guess at it until they got it right and that it could get quite expensive, I bet it could doing that! He called me and asked my opinion on what could be causing this and I told him I would ask you guys and see what you all think. I am leaning toward a bad 02 sensor but could this cause the mixture to run so rich as to almost be flooding? Any other suggestions? If the plugs are changed it would seem to run just fine for about 200 miles or so before fouling them out again. One odd thing is that as rich as it seems to be running there is no noticeable black smoke until after the plugs become fouled and it starts to miss.

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Old 08-14-2008, 03:20 AM
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Test them suckers

You can run tests on a majority of the sensors with a multimeter. Gonna have to look up the procedures to do it correctly, but it can be done at home. I would start with that dreaded O2 sensor, then the MAF sensor if it has one. If there is a sensor, there is a way to check it. May take some time but feasable. I can't look at my books right now to dig up the procedures... On a deployment again but here is a link to get things rolling. Good luck! Hope to hear good news.

http://wiki.answers.com/
Or just google testing O2 sensor.....

r/

Chris
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Old 08-15-2008, 02:35 PM
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FWIW, the problem turned out be the MAP sensor. I used the key on/off/on trick to get the check engine light to flash the codes and it produced a code 13 which is for the MAP sensor. I simply tapped on the thing lightly and wiggled the connector and the engine smoothed out, I then ran it for a while and the sooty plugs burned themselves clean again. We replaced the MAP sensor anyway in case the other one was actually bad and the tapping/wiggling might have been just a temporary fix. Just thought this info might be useful to someone else sometime, anyway my problem is solved.
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