Missfire

Tiny
COUNTRYGIRLDALLASCO
  • MEMBER
  • 2000 GMC JIMMY
  • 4.3L
  • V6
  • 4WD
  • AUTOMATIC
  • 310,000 MILES
I have recently bought three vehicles in the last two months the first two are completely dead in the water the third is my Jimmy and the person that bought it said that he had a battery in it drove it about twelve miles home parks in about eight to nine months ago has not had any time due to work to look at it he said something about it needs a new motor but then again it could just maybe be bad spark plugs or something that is causing the miss in the engine which is not bad at all it idalene it idles just missing every now and again the check engine light is flashing rapidly there sounds to be a little sputtering around the catalytic converter the engine has good power transmission seems to be shifting fine I crawled underneath it and the first thing I noticed was that the plate over the transfer case is not there so it's just exposed and there seems to be maybe you'd like some old fluids from something I do not know if it is coming from the transfer case or not but like I said the transmission seems to be shifting just fine also there is like a wine or almost a home and I thought to be the middle part of the car but I believe it's towards the rear end because I drove it about ten miles and went through some water and it is kind of a cool night and the rear end was hot enough it was steaming. Just needing maybe a some good suggestions on where to start
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Thursday, April 6th, 2017 AT 3:42 AM

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Tiny
COUNTRYGIRLDALLASCO
  • MEMBER
Also, I forgot to add that me and my buddies we at like plugged the map sensor into other sensors. One was back by the back of the engine and the other one was towards the left side of the engine. All three of those when we unplug them one at a time do not affect the running of the engine at all. Also, like I said it is not missing terribly bad at all it does not even want it out like it is about to shut off.
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Thursday, April 6th, 2017 AT 3:44 AM
Tiny
COUNTRYGIRLDALLASCO
  • MEMBER
Also, I forgot to add whenever I got it the gas gauge was slightly above the full mark. I could have been talked off and I thought that that had to be wrong I took it to the gas station and it will not accept no more gas so obviously the gas tanks full. But, at times it will go all the way past see and set there the low fuel light will be on and then all of a sudden it will shoot back up to past full. I do not know if that will help you related to anything just thought I would ask.
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Thursday, April 6th, 2017 AT 3:48 AM
Tiny
STEVE W.
  • EXPERT
Check engine flashing is probably due to the misfire. You need to get a code scanner and see what codes come up. Then go from there. Miss could be from a lot of things and unplugging the sensors will not help you. The misfires could be bad plugs, wires, distributor cap/rotor, bad spider injector unit, bad fuel pressure regulator, bad cam shaft, low compression, EGR could be stuck open, IAC could be plugged, ignition module could be faulty or it could be bad fuel or low fuel pressure. Could also be a plugged converter or exhaust. Or simply corroded connections from setting.

As for the fuel issue, the roll over valve on the tank likes to stick and the EVAP vent solenoids can get plugged with bug nests and block the fuel from entering. The gauge issue is probably a bad sensor or bad connection common on those.

Taking it to a shop and having them run some diagnostic tests would be a lot cheaper and faster than guessing and throwing a lot of expensive parts at it. Or if you can get a code reader or better yet a good scan tool and post some codes and do some tests we might be able to help you fix it yourself.

As for your other vehicles. Post about those in separate questions (one per vehicle please) and maybe we can give you some help with those.
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Thursday, April 6th, 2017 AT 5:50 AM

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