6k rpm 10lbs boost= engine miss

[spears032]

98 gst very minor upgrades. 16g turbo , front mount , turbo timer thats about it.
well heres the problem. car pulls fine at 10lbs of boost till it hits 6k rpm. then it bogs down and starts to miss . if u push it a bit it gives a small backfire and bucks , starts to pull again then starts to miss etc. replaced plugs and wires . idles fine starts fine .doesnt seem like a boost leak leanin more towards electrical.
any and all help appreciated

 

[tbonitz301]

Well. I would start by doing a boost leak testSince you say you don't THINK it's a boost leak that means you dont know. If that is not your problem start looking at ignition. What plugs are you running, and what are they gapped at?Do a search, and read the forum rules

 

[JayRolla]

Boost leak, sounds like the car is leaking out the air, but the ecu has already read the air adding the fuel for it. Causing you to run rich and missfire.

 

[spears032]

thanks jay for help will run a boost test asap . so this way ill know for sure

 

[gsxtasy]

What plugs and what gap?

 

[spears032]

plugs r autolite 63 and gap is set at .029 . a bit more info there is no engine miss in lower gears only third and up thanks

 

[gsxtasy]

Go pick up a set of NGK bpr6es' gap them at .028, just because it's cheap and you can then rule that out. Then do a boost leak test, and see what you find.

 

[heckles]

If it were the plugs, you would notice that miss all the time. But because I hate Autolite plugs with a passion , Id agree on switching to Ngks. The leak test should tell the tale.

 

[gsxtasy]

If it were the plugs, you would notice that miss all the time. But because I hate Autolite plugs with a passion , Id agree on switching to Ngks. The leak test should tell the tale.

Not necessarily, not if your getting spark blow out under maximum volumetric efficiency. Which would be right around 5500-6500rpms on a stock head/IM. That, however, would be more the gap of the plug than the brand, but our engine's seem to like NGK's best anyway.

 

[spears032]

i was driving my 2g and the check engin light came on it runs and idals fine intill i get the turbo going then it shows boost on the aftermarket gauge but the car shows no power but doesnt miss or smoke any ideas would be great thanks

 

[imagine3163]

I think its time to invest in a wideband.

 

[spears032]

a wideband???

 

[imagine3163]

It monitors your A/F ratio. There are tons of topics about them on this forum just search for it.

 

[spears032]

is it just one of the stock 02 sensonrs that upgrades to the wideband or safc?? im confused sorry man

 

[imagine3163]

is it just one of the stock 02 sensonrs that upgrades to the wideband or safc?? im confused sorry man

Read through these: http://www.dsmtuners.com/forums/search.php?searchid=5154743

 

[KelTsi90]

Do you have the stock bov?? Some of these can't handle boost and leak at hi-boost.

 

[Artago]

Do you have the stock bov?? Some of these can't handle boost and leak at hi-boost.

Good question.


Also, get a logger and a Wideband. +1 on the Boost leak test.


Tom