Problem rpm stops at 4000
Thread Starter
Instructor
Joined: Aug 2011
Posts: 114
Likes: 0
Problem rpm stops at 4000
Hi
I have a little curious problem.
yesterday i drove my vette at about 70mph. Then i hit full throttle. the rpm going up in a straight line until about 4000rpm 120mph then the acceleration stopped (pedal to metal).
when i go slightly up from the pedal and the ATG takes the next gear acceleration starts again, but slower for sure.
When i go away from the pedal and hit it again to the metal after one second acceleration starts also again and goes up to 6500rpm in the same gear it stopped before, then it shifts up. So the problem is not there every time. it often comes at high speed but not repeatable for testing.
there are no codes in the memory.
any idea what that could be? where i should start the search?
greets René
I have a little curious problem.
yesterday i drove my vette at about 70mph. Then i hit full throttle. the rpm going up in a straight line until about 4000rpm 120mph then the acceleration stopped (pedal to metal).
when i go slightly up from the pedal and the ATG takes the next gear acceleration starts again, but slower for sure.
When i go away from the pedal and hit it again to the metal after one second acceleration starts also again and goes up to 6500rpm in the same gear it stopped before, then it shifts up. So the problem is not there every time. it often comes at high speed but not repeatable for testing.
there are no codes in the memory.
any idea what that could be? where i should start the search?
greets René
Last edited by vollmi; Sep 19, 2011 at 10:58 AM.
Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
Hi
I have a little curious problem.
yesterday i drove my vette at about 70mph. Then i hit full throttle. the rpm going up in a straight line until about 4000rpm 120mph then the acceleration stopped (pedal to metal).
when i go slightly up from the pedal and the ATG takes the next gear acceleration starts again, but slower for sure.
When i go away from the pedal and hit it again to the metal after one second acceleration starts also again and goes up to 6500rpm in the same gear it stopped before, then it shifts up. So the problem is not there every time. it often comes at high speed but not repeatable for testing.
there are no codes in the memory.
any idea what that could be? where i should start the search?
greets René
I have a little curious problem.
yesterday i drove my vette at about 70mph. Then i hit full throttle. the rpm going up in a straight line until about 4000rpm 120mph then the acceleration stopped (pedal to metal).
when i go slightly up from the pedal and the ATG takes the next gear acceleration starts again, but slower for sure.
When i go away from the pedal and hit it again to the metal after one second acceleration starts also again and goes up to 6500rpm in the same gear it stopped before, then it shifts up. So the problem is not there every time. it often comes at high speed but not repeatable for testing.
there are no codes in the memory.
any idea what that could be? where i should start the search?
greets René
Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
I have heard of funny high RPM behavior when the valve springs are having problems. It is usually associated with aftermarket cams and it is because the springs are not strong enough. The valves end up floating/stumbling and cause a loss in power.
I thought that was at higher RPM than 4k though.
I thought that was at higher RPM than 4k though.
Thread Starter
Instructor
Joined: Aug 2011
Posts: 114
Likes: 0
I can change my brakedisks in front of my house, can i check the springs without special tools and other equipment?
Is there a DIY?
mfG René
Pro
Joined: Apr 2008
Posts: 628
Likes: 4
From: Columbia SC
Does your 2003 have an external fuel filter? Mid-way through that production year GM went to a different fuel system without an external filter. Change your filter if you have one--your breakdown sounds like a fuel delivery problem but of, course, it could be otherwise. Good luck and please post back to the Forum when you find the problem
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
This is a common occurance---I have found no fix---
However IF the eng coolant is cold the rev limiter is set to 4000'ish temporarily til it warms up--
Other than when being cold--My car will sometimes "SHORT SHIFT" for no reason IF I am on/off the throttle or in the middle of the RPM range when I do floor it----It never short shifts if I floor it to WOT and let it shift from a slow or dead stop---But sometimes if I am between gears like after leaving a stop--and I am loafing it--say around 40 MPH---then go to WOT it will short shift----It's just the nature of the beast !!
However IF the eng coolant is cold the rev limiter is set to 4000'ish temporarily til it warms up--
Other than when being cold--My car will sometimes "SHORT SHIFT" for no reason IF I am on/off the throttle or in the middle of the RPM range when I do floor it----It never short shifts if I floor it to WOT and let it shift from a slow or dead stop---But sometimes if I am between gears like after leaving a stop--and I am loafing it--say around 40 MPH---then go to WOT it will short shift----It's just the nature of the beast !!
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Thread Starter
Instructor
Joined: Aug 2011
Posts: 114
Likes: 0
Have also to check if mine has an external filter.
good night René
