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#1
04-20-2005, 12:39 PM
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1990 Chevy Lumin Engine/Tranny Problem?
I have a 1990 Chevy Lumina with a V6 3.1 liter engine, and recently its been having a rough idle, and when u give it gas, its rough and hesitates, and the car can not go past 45, once it reaches that speed it just shakes when u give it gas, wont go faster, and when i stop and it downshifts into first, theres a rough jerk as it downshifts, its an automatic trans, and i dunno what the problem is, i think some trans fluid is dirtly and clogging something, but im not sure, any help would be great
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2009 Pontiac G6 2.4L L4 2007 Buick Lucerne CXL 3.8L V6 2007 Chevrolet TrailBlazer LT 4.2L L6 1993 Oldsmobile Cutlass Supreme SL 3.1L V6 
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#3
04-22-2005, 05:19 PM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
did a tune up, new plugs and wires, everything LOOKs good, all tht we could do for a tune up was done, service engine light is OFF
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2009 Pontiac G6 2.4L L4 2007 Buick Lucerne CXL 3.8L V6 2007 Chevrolet TrailBlazer LT 4.2L L6 1993 Oldsmobile Cutlass Supreme SL 3.1L V6
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#4
04-22-2005, 06:55 PM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
Hmmm. this isn't my area of expertise. What comes to mind first is EGR passages are clogged or an injector being bad.
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Great quote: "I am noticing a loud fuel odor"
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#5
04-22-2005, 06:57 PM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
are you getting spark to all 6 cylinders? could be a coil pack (thus making it only run on 4) bad too.
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Great quote: "I am noticing a loud fuel odor"
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#6
05-09-2005, 10:51 AM
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There seems to be a spark on all 6. i took a spark plug wire and an old spark plug and held it to ground. there are many sparks on all cylinders so im pretty sure thats fine..not sure what else it could be
__________________
2009 Pontiac G6 2.4L L4 2007 Buick Lucerne CXL 3.8L V6 2007 Chevrolet TrailBlazer LT 4.2L L6 1993 Oldsmobile Cutlass Supreme SL 3.1L V6
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#7
05-09-2005, 12:26 PM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
Make sure the MAP sensor has a good vacuum supply, sometimes the old line gets soft and collapses with suction or splits, and the MAP can't do it's thing. Makes 'em run like shit, like you descibe. Replace it if there's any doubt.
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You made three mistakes. First, you took the job. Second, you came light. A four man crew for me? F**king insulting. But the worst mistake you made... ...empty gun rack.
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#8
05-11-2005, 12:48 PM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
The vacuum lines to the sensor look fine. and they all have a suction on them...i'll take a look at the entire lines, and maybe check out the MAP sensor, what is that sensor by the way and what does it do
__________________
2009 Pontiac G6 2.4L L4 2007 Buick Lucerne CXL 3.8L V6 2007 Chevrolet TrailBlazer LT 4.2L L6 1993 Oldsmobile Cutlass Supreme SL 3.1L V6
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#9
05-11-2005, 12:57 PM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
MAP (manifold absolute pressure) tells the computer what the level of air pressure or vacuum is currently in the intake, allowing it to figure how much fuel is needed to burn clean. I don't think your year had MAF (mass air flow) yet, which allowed them to directly sense the volume of air entering the engine.
Both would make them run really awful if they go bad.
__________________
You made three mistakes. First, you took the job. Second, you came light. A four man crew for me? F**king insulting. But the worst mistake you made... ...empty gun rack.
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#10
05-11-2005, 12:58 PM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
Rereading, it does sound more like something a bad coil pack would do.
MAP and MAF issues usually involved stalling and really hard hesitations.
__________________
You made three mistakes. First, you took the job. Second, you came light. A four man crew for me? F**king insulting. But the worst mistake you made... ...empty gun rack.
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#11
05-11-2005, 01:01 PM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
You get any intake backfire when you try to stomp it? Does it feel like it's trying to pull through it, or clear out, or just go flatter when you stomp it? Any smoke?
__________________
You made three mistakes. First, you took the job. Second, you came light. A four man crew for me? F**king insulting. But the worst mistake you made... ...empty gun rack.
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#12
05-11-2005, 04:54 PM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
what do u mean by stomp it. like plug up the vacuum tube or what?
__________________
2009 Pontiac G6 2.4L L4 2007 Buick Lucerne CXL 3.8L V6 2007 Chevrolet TrailBlazer LT 4.2L L6 1993 Oldsmobile Cutlass Supreme SL 3.1L V6
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#13
05-12-2005, 06:46 AM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
No, just when you press the gas down harder and try to get it to go. Does it feel like it just gets worse the more pedal you give it? Does it ever give you any backfire "woofs" through the intake?
I really think you've got spark breaking down under load. How old are the plugs and wires? Ever replaced coil packs or module?
__________________
You made three mistakes. First, you took the job. Second, you came light. A four man crew for me? F**king insulting. But the worst mistake you made... ...empty gun rack.
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#15
05-16-2005, 07:56 AM
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Re: 1990 Chevy Lumin Engine/Tranny Problem?
That's possible. A vacuum test could spot that quick.
__________________
You made three mistakes. First, you took the job. Second, you came light. A four man crew for me? F**king insulting. But the worst mistake you made... ...empty gun rack.
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