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Misfire Issues

Chris94GTR
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Chris94GTR Newbie

Chris94GTR

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Posted

Hey guys. So I bought a 1994 R32 GT-R. Car drove amazing when I first got it. It only has 84,500 km's on it. The weekend of the week I picked it up. I decided to do a service which entailed:

. Oil

. Oil filter

. Air filter

. Rocker cover seals and half moons

. New front brakes

. Fuel filter

. Iridium spark plugs

The car already came with splitfire coil packs.

After driving for a couple of days, I noticed my car started to have a bit of a stutter. Wasn't bad. Few weeks later I went for a drive was stuck in traffic for a bit then when I started to drive it started to misfire severely. It started to sound like a wrx. It was a warm day but it never used to do that. Took it to an auto electrician tested everything possible that could cause a misfire and everything was getting power. Did a comp test all cylinders had the same reading. Changed coil packs and spark plugs and it still does it. When it's first started and driven it's fine. As soon as I drive for 30 mins it starts to miss. Even if I have short drives, turn it off start it again it struggles at idle thwn revs pick back up. I lose alot of power and is super sluggish!

Any ideas on what it could be?

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SkudR33 Proficient

SkudR33

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Posted

Did you throw out your old spark plugs? Try throwing them back in - my first ever mistake when I bought my car was my initial home service... I didn't gap the spark plugs properly.

Also try doing a warm compression test and leak down test immediately after it starts shitting itself...

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Chris94GTR Newbie

Chris94GTR

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Yeah see i threw my old ones out. I put iridium ones in. I took them out to notice that one of them was cracked.I put cheap ngk ones in because that's what was in it originally but it still stutters and sounds like it's choking! The compression test I did was hot. Was making compression fine! Do you thibk I need a bigger gap?

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MrStabby Grand Master

MrStabby

Posted
Posted

Do the AFM solder fix.

This. Search the DIYs for it.

BTW opening up the plug gap makes it harder for the spark to jump, so if you're troubleshooting a missfire at max torque you would close it up.

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mr skidz Veteran

mr skidz

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Posted

That happened to my car before massive pain in the ass can't even get my hand on it that's how shit the spot is right up against the firewall on the intake manifold gasket about a 4 mil chunk spat out. best way to check is pump compressed air through the pipe work after the cold side of the intercooler and test for air leaks you hear it gushing out at the back at the firewall it's in a flamin mongrel of a spot it would be easier to pull the engine out and change all your gaskets at the same time to metal ones even head gasket would be worth doing while engine is out.

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