engine surging problems
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Pro
Joined: Apr 2007
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From: Mc Farland Wisconsin
engine surging problems
Ive had this problem for a while now and its somewhat hard to explain. If im going through a parking lot in 1st or 2nd gear and the throttle is between like 0% and 5% the car will almost freak out and start surging to the point where you feel like your getting whiplash. The same goes for almost whatever speed your going at really, I noticed it the most last week on my road trip, being on the interstate in 6th gear and when starting to go down a hill, the throttle would almost close and it would start surging going down the hill. Does this have something to do with a poor tune? No codes for this. car is 00 coupe, 6 speed, longtubes, drop in filter, 42lb injectors, 3.73 rear. Hope thats enough info and hopefully someone else has some insight on this!
Thanks!
Thanks!
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From: Howell Michigan
St. Jude Donor '09-'10-'11
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From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Your engine is getting confused with what air flow it needs. Either you have un-metered air entering the engine, a vacuum leak or a poor tune. Try a idle relearn procedure and then get your tune looked at.
BC
BC
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From: Mc Farland Wisconsin
Ive had this problem as long as ive owned the car. Ive had many parts of the car out since then, including tranny twice, ive had airbridge everything off and on many times. Im doubting a vacumm leak, and ive had the battery disconnected all winter both winters, so im guessing that it would clear any kind of idle relearn? It does idle just fine, its only at very low throttle that it ever does this, i have to coast with the clutch in coming into work cuz it will backfire and surge and bla bla. I want to have a tune done, but i just dont know if it will be worth it with my mods.
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From: Schaumburg IL
CI 7-8-9-11 Veteran
St. Jude Donor '06-'10, '13
I agree with the rest, it has to be in the MAF sensor, or as Bill said you have unmetered air entering the engine somewhere,, loose filter, or airbox etc..
You say you have had the car apart many times etc.. including the airfilter box etc.. i would double/triple check all connections..wires, harnesses etc.. Also, you said "drop in filter" do you mean an aftermarket filter? Did you have to oil the filter? Just a long shot but if you have oil on the maf wires/sensor it would do that too..although you said it idles fine so it might not be that.
Ohter than that, have your aftermarket tune checked for problems.
You say you have had the car apart many times etc.. including the airfilter box etc.. i would double/triple check all connections..wires, harnesses etc.. Also, you said "drop in filter" do you mean an aftermarket filter? Did you have to oil the filter? Just a long shot but if you have oil on the maf wires/sensor it would do that too..although you said it idles fine so it might not be that.
Ohter than that, have your aftermarket tune checked for problems.
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From: Van Buren Arkansas
Wounded Warrior Escort '11
With the mods to the car, its hard to know but the first thing that came to mind with a stock set up car would be the pcv valve connection tube, if you still have one. Its a possible source of a large vacuum leak.
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Pro
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From: Mc Farland Wisconsin
Would it still idle perfect if that were the case? I do have an ls6 valley that im going to install someday, so if there were a broken line im sure i would find it at that time right?
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From: Dyer, IN
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From: Mc Farland Wisconsin
They were on the car when I bought it. The guy I bought it from started to unmodify it before the purchase, removed the supercharger, but thats all the farther he got with it. It still gets very good gas mileage on the highway, I just went on a 1800 mile road trip and got an average of 33 mpg on the way there and 29 on the way back. I guess i was kinda thinking it might be in the tune, but not sure?
Tech Contributor
Joined: Jan 2007
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From: Dyer, IN
They were on the car when I bought it. The guy I bought it from started to unmodify it before the purchase, removed the supercharger, but thats all the farther he got with it. It still gets very good gas mileage on the highway, I just went on a 1800 mile road trip and got an average of 33 mpg on the way there and 29 on the way back. I guess i was kinda thinking it might be in the tune, but not sure?
Depending on what he had done to the car, and if he had it tuned, it may need a tune...
Melting Slicks
Joined: Jan 2002
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From: Nokomis FL
