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98 R34GTT 4k engine stumble

JC71

By JC71,
in R Series (R30, R31, R32, R33, R34)

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JC71 Community Regular

JC71

Posted
Posted

98 r34 gtt

Been rocking my latest setup and car running like never before.

Have put a good 200 miles on it since all the latest changes and additions.

everything is dialed in and have been driving it a bunch.

 

However, all a sudden last weekend as soon as I pushed throttle passed 4k and the engine stumbles, (slow or fast acceleration) hesitates and doesn’t go above 4100 or so, like a misfire. Everything else seems fine.

I had a “good” set of coil packs that I removed from car when I first got it when I changed them over to new coils.

I swapped out current ones for those, but no change. I also changed the plugs, no change.

Seems to rev over 4 when out of gear with no load just fine no “misfire”, but as soon as its in gear with a load of any kind, it “misfires” as soon as rpm drop back below 4 k it runs perfectly, smooth, starts, restarts and drives fine as long as I keep it below 4 k while in gear.

All readings look fine, no CEL

 

Any idea as to what could all a sudden cause an issue when pushing rpms passed 4 k?

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https://www.sau.com.au/forums/topic/486557-98-r34gtt-4k-engine-stumble/
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Spearzy999 Apprentice

Spearzy999

Posted
Posted

Hi mate I am having an identical issue with my 98 R34 GTT. The engie suddenly cuts out under load at about 3-4k, black smoke out exhaust. Almost feels like traction control kicking in. No CEL but still going to check codes later today.

Car was sitting in the shed for about 5 months before hand and only idled a few times, took her out with about 1/4 tank, filled up and thats when the issues started happening. 

Threw on a spare set of coils/harness and checked plugs which was no help. Recently had fuel pump/filter changed so surely thats not the issue unless condensation in fuel, I just havent had the time to drain it

It's running a hi flow turbo, bosch 1000cc injectors, walbro 450L, Z32, Nistune etc... All about 2000km old.

Yeetus Apprentice

Yeetus

Posted
Posted

Run some injector cleaner through it

I had a similar issue that plagued me for months, even tried replacing the cat. If one or more injectors are blocked up the ecu sees ping so pulls timing and makes the tune rich overall, you'll see black smoke coming out of the exhaust and like me assume it's running rich but it could only be one or two cylinders 

$10 bottle of injector cleaner and the next time I hit boost it pumped out a huge plume of black smoke, cleared the blockage and then ran great, if that's not the issue it's only a cheap thing to try haha

 

GTSBoy Grand Master

GTSBoy

Posted
Posted
1 minute ago, Yeetus said:

Run some injector cleaner through it

I had a similar issue that plagued me for months, even tried replacing the cat. If one or more injectors are blocked up the ecu sees ping so pulls timing and makes the tune rich overall, you'll see black smoke coming out of the exhaust and like me assume it's running rich but it could only be one or two cylinders 

$10 bottle of injector cleaner and the next time I hit boost it pumped out a huge plume of black smoke, cleared the blockage and then ran great, if that's not the issue it's only a cheap thing to try haha

 

Not a terrible idea. But if I ever had concerns that my injectors were sufficiently dirty to be causing me a problem, they would be out of the engine and onto the actual injector cleaner/testing bench.

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Yeetus Apprentice

Yeetus

Posted
Posted
1 minute ago, GTSBoy said:

Not a terrible idea. But if I ever had concerns that my injectors were sufficiently dirty to be causing me a problem, they would be out of the engine and onto the actual injector cleaner/testing bench.

Given what I know now - same haha, but this was 12 years ago with second hand 740cc Nismo injectors in my S15 daily, I was too busy hunting elsewhere for the issue to even look at the injectors, running through some cleaner was a happy coincidence haha

Duncan Grand Master

Duncan

Posted
Posted

Given it happened suddenly, and when you come on boost, I'd check all your inlet - hose clamps in place and no split rubber or silicone hoses. Even the hard to get to ones near the intercooler. It's possible air that went past the air flow meter is being dumped out a big hole.

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      98 R34GTT 4k engine stumble

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      Given it happened suddenly, and when you come on boost, I'd check all your inlet - hose clamps in place and no split rubber or silicone hoses. Even the hard to get to ones near the intercooler. It's possible air that went past the air flow meter is being dumped out a big hole.
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