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hey everyone, lately ive been having this problem while driving.
usually at about 50 mph, which from what ive read is right about when 5th gear engages (atx), my car has this jerking sometimes if i accelerate lightly. i cleaned my MAF and that solved it, but it has come back again, and seems to go away every time i clean the MAF. for a while it was bad enough to throw a CEL for lean bank 1, but its not quite that severe this time and no CEL. its usually just one or two jerks until i get to about 60 mph while mildly accelerating.
i guess my question is that although the MAF clean seems to fix it completely, why does it only do it in 5th gear? ive tried to reproduce the problem at a lower gear/speed, but no go. it only happens while lightly accelerating and at the lower end of 5th gear.
any help would be great thanks everyone.
-sean
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well cant edit now.. but i wanted to add, i have searched and its not the slam shifting or anything like that, it doesn't shift when it does this at all, the car just jerks.
-sean
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Joined: Oct 2002
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Engine?
Mileage?
Year?
Does the overdrive light flicker?
Codes?
Possible torque converter lockup problem.
Possible misfire.
Sensor problems affecting shifting, mixture, or misfire.
Are the plugs, wires, O2's, EGR system, and PCV system in good shape? No vacuum leaks? Timing belt good if Zetec?
Does it happen with overdrive off?
Need more to go on.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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Joined: Jun 2004
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Originally posted by Rogerm60:
Engine?
Mileage?
Year?
Does the overdrive light flicker?
Codes?
Possible torque converter lockup problem.
Possible misfire.
Sensor problems affecting shifting, mixture, or misfire.
Are the plugs, wires, O2's, EGR system, and PCV system in good shape? No vacuum leaks? Timing belt good if Zetec?
Does it happen with overdrive off?
Need more to go on.
its a 96 ATX zetec w/ 127k miles. no OD light, never had that flash at me, no CEL like i said, and when there was (a previous time) it was lean bank 1. like i said also, shifting is fine, everything runs great, until i hit about 50, it shifts to 5th gear (i think its 5th?) and until i hit about 60 it usually jerks a couple times.
i dont think it could be timing belt or vacuum, as it completely went away by cleaning the MAF. the other stuff, im not sure. i cant get the PCV valve out. EGR, not sure ill look into it. it doesnt happen with overdrive off at that speed, because it only seems to happen at pretty low RPM's. im just real stumped, i mean i guess all it really is, is a dirty MAF, but i cant figure out why. i cleaned it about two weeks ago, it cant get dirty that quick can it?
-sean
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Joined: Oct 2003
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Addicted CEG\'er
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Originally posted by Esty Savage:
Originally posted by Rogerm60:
Engine?
Mileage?
Year?
Does the overdrive light flicker?
Codes?
Possible torque converter lockup problem.
Possible misfire.
Sensor problems affecting shifting, mixture, or misfire.
Are the plugs, wires, O2's, EGR system, and PCV system in good shape? No vacuum leaks? Timing belt good if Zetec?
Does it happen with overdrive off?
Need more to go on.
its a 96 ATX zetec w/ 127k miles. no OD light, never had that flash at me, no CEL like i said, and when there was (a previous time) it was lean bank 1. like i said also, shifting is fine, everything runs great, until i hit about 50, it shifts to 5th gear (i think its 5th?) and until i hit about 60 it usually jerks a couple times.
i dont think it could be timing belt or vacuum, as it completely went away by cleaning the MAF. the other stuff, im not sure. i cant get the PCV valve out. EGR, not sure ill look into it. it doesnt happen with overdrive off at that speed, because it only seems to happen at pretty low RPM's. im just real stumped, i mean i guess all it really is, is a dirty MAF, but i cant figure out why. i cleaned it about two weeks ago, it cant get dirty that quick can it?
-sean
im pretty sure that you mean 4th gear... the ATX only has 4 (if im not mistaken) the first 3 are your standard around town gears, then 4th is overdrive.
98 Corolla LE 1.8L DOHC 1ZZFE
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... if a jelly fish stung me.. would you pee on the wound?
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If you're running an open element filter that you have to oil up, the MAF can get a bit of oil onto it rather quickly. I'll assume you're running a stock intake...
No CEL of any kind make me think you have the occasional misfire. The Contour engines are particualarly sensitive to the plugs & wires you use. I hope you have stock Motorcraft for both. That will be a good starting place.
Must be that jumbly-wumbly thing happening again.
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i do have a stock intake, no open air or anything.
i dont see how it could be occasional misfire really. it only happens when going into 4th gear, and only towards the bottom of it at low rpms.. i wish i had a tach to know what rpms is really does it, because once it gets to a certain point in the RPM's it stops.
the biggest reason im skeptical is because of last time this happened. i had a CEL and it was two codes, lean bank 1 and 3rd cylinder misfire. there were also two very specific symptoms. i had the jerking, which was worse back then, it was basically any low RPM's and then also very little power all the time. when i cleaned my MAF, the jerking went away, but the low power was still there. obviously the new spark plug fixed that.
this reason really makes me think that it wouldnt be a misfire as ive got the power like normal, and since its so specifically just low RPM's.
sorry for the long post, just trying to describe everything in the right words, hope it helps. im cleanin my MAF again, so im sure this is going to go away again, but any more ideas are greatly welcome.
-sean
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Joined: Oct 2002
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Are the plug wires original?
Is the tranny fluid original?
Misfires certainly can occur only at low RPM under load. A mixture problem would aggrevate this.
It seems likely that the torque converter lockup point is hunting around. This happens in a narrowing speed band as power is increased. Engagement may be faltering if the fluid is old or the PCM may be getting fluxuating data from the sensors about speed and engine load. Cleaning the MAF probably increased the apparent engine load and moved the engagement point up some.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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Oh BTW, a malfunctioning PCV system can cause lots of oil vapor to get into the intake system possibly getting on the MAF. Check for liquid oil in the resonator.
"Those who cannot remember the past are condemned to repeat it" -George Santayana
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I'm having this same problem with my 98 Contour Sport, V6. I had the MAF sensor changed about six months ago and just recently had my O2 sensors changed because I was getting a cel with this problem. Although after driving it for a couple of days the cel light came back on and now I am getting a Po420 code. I get the same sputter/hesitation when I get on the high way, it is only about two or three small jumps and as I pick up speed it goes away. Let me know what you end up doing because maybe it will help me out, I am going to have my MAF cleaned tomorrow.
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