hesitation at 5.5k rpm

[pmp285]

i need help... im running a 2g eclipse engine, 14b turbo, 450cc injectors, evo2 7701 ecu, 190lph fuel pump, 609maf, hks ssqv BOV.... part throttle it runs fine, but if i step on the gas pedal hard, it kinda hangs then chokes a bit and accelerates slow... happens during boost... normal driving, drives fine... what could be causing this? fuel issue?

 

[prove_it]

Boost leak?

Check your plugs and see if they are shot. Is there any smoke like your running stupid rich?

 

[pmp285]

havent done BL test yet. i just changed the plugs about 500 km. no smoke unless i rev it above 6k at station. will old plug wires cause the prob? sparks ok though

 

[prove_it]

If you got a bad plug that's misfiring it could. I've had brand new plugs crack and arc out the side before.

It's always an easy check to verify plus you can "read" the plugs and see if you have one cylinder that leaner or richer than the others.

 

[belize1334]

Double check your timing. If it's too far retarded it'll get blown out and you'll have a bad miss under load and higher rpms.

 

[pmp285]

ill check later.. hopefully its just timing issues...

 

[pmp285]

no boost leaks, SP all ok, timing at 5deg. might be my FP. ill try swaping my stock FP tom

 

[OMFGeofffff]

I had a similar problem. It would hesitate at high rpm but it would get worse and worse(lower rpm). I did it all at once so I don't know which solved it but I replaced the fuel pump, plugs and MAF. I don't know if it will help you but it's some suggestions.

 

[pmp285]

my plugs are ok, so, ill check my maf and pump later on... thanks

 

[pmp285]

it was the FP after all... thanks for the advise guys