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10-28-2013
I've asked numerous people about this and still can't find a decent answer, but I will be cruising on the highway and out of no where (usually when I'm going up a hill or there is resistance on the car) the engine or trans will jerk sometimes harder than others and rpm's will jerk with it so that makes me think it's a trans related problem but there are no service lights. Has anyone had this problem before?
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10-28-2013
That is the car downshifting so that it can make it up the hill.
My Intrepid does the hard downshift too but I have yet to figure out if it's bad (or more than likely how bad it is)
Originally Posted by BoostenGTP
10-28-2013
I know for a fact it's not downshifting, has to be a component that is moving while cruising near 75-85mph
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10-28-2013
is it making boost when its happening
10-28-2013
Nope, just regular cruising, 23-2800rpms is the range it will happen in
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10-28-2013
Torque converter is my guess.
How long since the last service and age of the trans?
A new filter with some lucas might help it but it might not.
10-28-2013
I couldn't tell you, and I keep thinking it's the torque converter just because it's while I'm cruising, not just a shift thing
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10-30-2013
You could have a coil going out or something silly in the igniton system.
10-30-2013
My Cavalier was doing the exact thing you described recently. Turned out to be a bad spark plug wire.
Last edited by CBWhite; 10-30-2013 at 02:38 PM.
10-30-2013
Well let's hope that's all it is, I'm gonna get new plugs and wires as well to go with my used ICM and Coils From Morad parts
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10-30-2013
I don't know if you already know this, but don't install everything all at once. Swap the coils than drive it and see what happens and than the next thing etc; etc.
Last edited by CBWhite; 10-30-2013 at 03:30 PM.
10-30-2013
My guess is you need a tune up.
10-30-2013
You can, but if you do it one part at a time and it turns out to be let's say the plugs than you'll know. So you can keep the other parts for spares. Believe me spare coils or wires or whatever can come in handy. If this is the problem you can still install everything you bought. Just keep the old good stuff for backup.
10-30-2013
I had this exact issue on my old GTP. It was caused by a bad VSS blipping out momentarily. The car would think that it went to 0mph for a second, and try to downshift to first. Watch the HUD or speedo when it happens to see if you can catch the blip.
-Rob
10-30-2013
Okay, I'll do the ICM and spark plugs first, the plugs will be brand new and if it still does it then I'll swap the coils
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10-30-2013
Start with plugs (autolite 606) gapped at .055 and wires
Throw a bottle of seafoam in the gas and put another threw the vac port under the blower snout. Take off the vad hose and connect another one so you can poor the bottle into it. Have someone start the car and sit to make sure it doesnt stall. Slowly poor bottle into the hose and keep it form stalling until you get to like 1/16 left and poor it in quickly to stall it out, if it doesnt have the person shut off car. Warning car is going to smoke like crazy. Let it sit for 20 mins and start it up and idle for a min or so and start reving lightly until the exhaust stops smoking.
Change your pcv
Take your tb off and clean it
Clean your maf with maf cleaner
Might be worth changing your vac hoses if they are original. Only a couple bucks for hose and Ts so why not.
Change you fuel filter with an ac delco
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