R32 Gtst Sputtering/ Missing Under Boost

[jj_syed]

Hey guys, cheers from Calgary, Canada! its my first post on this site so go easy on me I have a 92 gtst with the standard rb20det. to keep the long story short it misses in high rpms ONLY under boost.

I have pretty much tried everything, taken it to many places yet no solution. When i first got the car 2 years ago the throttle was very jumpy and overly sensitive. So that turned out to be my tps being set at 0.11 and Cas was turned completely CWW. And that time it was running fine but felt like there was no top end power after 5k. After the tps adjustment and CAS being set at 15. Car feels like it has more power up until u hit 4k it just sputters and bogs.

However if u just tap the gas and wait for the rpms to climb slowly it does it with no hesitation.

Here is the list of things I have done so far:

-changed the plugs to ngks irridiums last september gapped at 0.8mm (re chaecked them and they are still ok)

-Changed fuel filter and fuel pump with walbro 255

-cleaned maf with sensor clean (helped with response but problem still there)

-Octane booster, seafoam

-set tps at 0.46v ( made the the car idle at 1200 rpm.....)

-checked coil packs, visually they seem to be fine

Any suggestions??????

Thanks

[StevenCJR31]

what octane fuel are you using?

[mad082]

it is most likely going to be the coils. try taping up the lower section of the coils (from where they mmount to the bracket down) with electrical tape and see if that helps at all.

[DVS JEZ]

New coil packs as mad said. U cant tell if thyre bad just from looking at them.

[jj_syed]

I use 94 octane thats the highest octane we can get here

I will be trying to tape up my coils and recheck them. I hear just using a multimeter isnt enough to tell whether they are bad or not!

I will also try using some copper core and re gap them for to test and see if it helps.

Keep u guys informed thanks for the replies!!!!

[jj_syed]

I have noticed another thing recently too, seems to miss in lower rpms a bit when the engine is fully warmed up after like 20 mins of driving.....could that definately be my coils then?

[Truffles]

I use 94 octane thats the highest octane we can get here

I will be trying to tape up my coils and recheck them. I hear just using a multimeter isnt enough to tell whether they are bad or not!

I will also try using some copper core and re gap them for to test and see if it helps.

Keep u guys informed thanks for the replies!!!!

That could also be your problem. Over here, we generally run ours on 98 octane.

get copper plugs and regap to 7mm then try it. If the problem persists then use quality electrical tape to insulate around the block part of the coilpack. Or even better, use a heat resistant silicon in the crack on the block part. There was a thread about the silicon but I can't find it.

[boiracer]

tape and silicone worked a treat on mine. but mine had the stutter only when cold in winter when you hit it getting onto a highway.

any basic silicone will stand more than enough heat for where the coil packs sit. smear a bit on each coil, wrap em up with good electrical tape and your off (if of coarse this is the problem)

Edited June 5, 2011 by boiracer

[jj_syed]

I will be using silicone tomorrow and retape the boots and see if that solves the problem. I also read that if u relocate the ignitor that sits on top of the plug cover helps because that tends to overheat and fail, has anyone tried yet?

[jj_syed]

ITS FIXXEDDDDDDDDDDDDDDDDDDDDDDDDD

changed the plugs to copper cores gapped at 0.8mm and siliconed the base of coils, taped the rubber boots on the coil packs.

it purs in high rpms!!! i havent hit 6k on this car in sooooo long!!!!

THANKSSSS GUYS i hope this helps others with similar problems

[DVS JEZ]

Well done buddy. Good feeling when stuff like that works and saves u on new coil packs.

[jj_syed]

I know man its such a good feeling when i floored it......its undescribable but im sure all of us have felt it