Car runs leans after a pull 50 percent of the time
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Joined: Jan 2015
Posts: 85
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From: California
04 E55 99 SC400 01 Z06 Corvette
Car runs leans after a pull 50 percent of the time
Car runs leans after a pull 50 percent of the time after I restart it its fine until another wot, any ideas? Have tried 4-5 different tunes was told to check plugs about 5k on them and sc pulley gap which I believe is at 0.35 ill be checking soon, other than that car pulls hard before the issue occurs, mods are weistec plugs, tcu tune, mbh header, 180 cp, 83 sc pulley, kc, 90mm tb, 550 bosch injectors, tune, any help would be appreciated
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From: Christchurch, New Zealand
CLS55
I had this issue without throttle body upgrade was putting up a none engine light maf code. Turns out it was a vaccum hose loose in the right hand (facing engine) surge tank. Think its related to that metal hose over the valve cover on that side.
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From: Christchurch, New Zealand
CLS55
Well I had the issue in which after driving for a bit my fuel trims would go go 25% and the car would idle like a wild bull and buck under deceleration in and in all manners act like the hiccup issue as far as I coukd tell. Rebooting the car would resolve the issue for a while. I am on stock TB. I think if the computer cannot make sense of inputs it crashes. Dealer found the vaccum leak and presto no more wild, spluttering bull mode. Surely one of the 5 tunes had the TB hotfix? Your probably right but he mightve created a leak when doing all those nice mods? 
Thread Starter
Member
Joined: Jan 2015
Posts: 85
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From: California
04 E55 99 SC400 01 Z06 Corvette
I was hoping it was not the lean hiccup issue mine only does this after i give it wot most of the time, it does not do it randomly driving only after a pull, sometimes if i come to a full stop it goes away until i get on it again, How would this get tuned out on a dyno?
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Joined: Jan 2015
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From: California
04 E55 99 SC400 01 Z06 Corvette
Thanks Hulk not what I wanted to hear maybe have to step down to stock or 82mm tb again I guess, I checked for vacuum leaks none found and all new gaskets and seals
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Super Member
Joined: Jan 2017
Posts: 860
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From: Christchurch, New Zealand
CLS55
Thread Starter
Member
Joined: Jan 2015
Posts: 85
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From: California
04 E55 99 SC400 01 Z06 Corvette
I replaced the spark plug wires and plugs in the last 5K miles other than that for the ignition part everything else has not been changed, i have yet to check the ltft's, What do i look for while paying attention to them?
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From: Christchurch, New Zealand
CLS55
Get a way to monitor short term fuel trims, note any changes in behavior when cars in mucked up mode. Also check your long terms anything over 5 in either direction from 0 is suspect.
Check codes when its still running in mucked up mode. Mine didn't show after a restart or generate a engine light but was there.
Check codes when its still running in mucked up mode. Mine didn't show after a restart or generate a engine light but was there.
