engine surging problems
Thread Starter
Pro
Joined: Apr 2007
Posts: 635
Likes: 0
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!
Tech Contributor
Joined: May 2008
Posts: 2,843
Likes: 16
From: Howell Michigan
St. Jude Donor '09-'10-'11
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
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
Thread Starter
Pro
Joined: Apr 2007
Posts: 635
Likes: 0
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.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: Jun 2004
Posts: 19,459
Likes: 48
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.
Tech Contributor
Joined: Dec 2006
Posts: 10,962
Likes: 29
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.
Thread Starter
Pro
Joined: Apr 2007
Posts: 635
Likes: 0
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?
Tech Contributor
Joined: Jan 2007
Posts: 19,456
Likes: 1,165
From: Dyer, IN
Thread Starter
Pro
Joined: Apr 2007
Posts: 635
Likes: 0
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
Posts: 19,456
Likes: 1,165
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
Posts: 2,754
Likes: 0
From: Nokomis FL
