accelaration problem, please help!

[goran]

When I floor it at full boost car starts to hesitate. I'm getting like mini fuel cuts. Also it feels like im getting detonations in my exhaust? Otherwise when not boosting car runs fine, no problems at all.
Car is stock except free mods, k&n, boost guage.
Fuel filter was changed not long ago, same with spark plugs. I did a boost leak test, found couple small leaks, fixed them. Car feels a little better.
The only thing I did not check yet is TB and fuel injectors.

Any other suggestions?

Thanks!

 

[andymoraitis]

You've got a good start on your trouble shooting, but there's a few more things to check:

1. Plugs were done, but what brand are they and what gap did you use?
2. It may not be the plugs, but the wires. If you're not sure how old these are, replace them as well.

Depending on your setup, NGK BPR6ES (for close to stock boost levels) or 7ES (above 15-16 psi) gapped to .028 would do well. Platinums will cause the hesitation that you're experiencing and too wide of a gap can also make the spark blow out under boost. As far as wires go, Magencore 8.5's are a good choice as are NGK's.

Check on those things and let us know what you find.

Andy

 

[talondude4]

Also you may want to check your ignition timing, mine did the same thing till I dialed it in to spec.

 

[goran]

Yeah, I dont use any other plugs then NGK BPR6ES. Checked wires, all good.. I'll check ignition timing. Thanks!

More suggestions?

 

[GST with PSI]

i fixed my problem with a new set of properly gapped ngk plugs BPR6ES. never know, one of yours could be a dud. this is what my car was doing.

http://dsmtuners.com/forums/showthread.php?t=195946