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Fuel Cutting Off Or Something Else?

agentx

By agentx,
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agentx Rising Star

agentx

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Posted (edited)

Hi guys - was searching through alot of posts for the past few hours, this problem started happening around a week ago and has gotten worse since.

Symptoms:

Car doesn't start first time around

If I push on the throttle even slightly, it feels like the fuel supply has cut off ... ONLY happens under load not while stationary

Car turns off from time to time at traffic lights etc

Drives sluggish but ok at a steady speed, i.e. if I'm going on the freeway at 100 or on a street at 60 while keeping the throttle stationary.

Things I've changed:

Spark plugs, properly gapped

Cleaned AFM

Inspected coil packs (yellow jackets with less than 1000 km on them)

Cleaned most contacts with contact cleaners

Changed fuel filter

The fuel pump sounds like its priming, the old fuel pump was replaced with a new walbro unit less than 1000 km ago from dr drift, could that still be a culprit? From what i've explained, does this sound like a fuel issue or could be something else?

The only other thing i've noticed is a light on the HUD coming on alot more than it used to, here's the pic ... http://i45.tinypic.com/2m7axap.jpg ... I was told last time that this means a collapsed CAT? Would a collapsed CAT cause these symptoms? I put in a used (good quality) CAT around 2000 km's ago.

I'll take it to a mechanic as soon as I can but thought i'd check here for some friendly advice =)

Thanks guys!

Edited by agentx
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agentx Rising Star

agentx

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Checked the above, no apparant leaks etc after a thorough inspection - and CAS is tight. Took AFM off and did the dry solder fix, the car is now hesitating for a few seconds initially under load but once i back off the throttle and ease into it again, it goes fine =/ if it was the AFM, it wouldn't be fine after that would it? Goes fine even till 7k rpm after that and pulls fine..

The EGT light is coming on alot now, next step will be the ECU diagnostic unless anyone else has any other suggestions?

GoHard Collaborator

GoHard

Posted
Posted (edited)

I would have done a diagnostic check before i started re-soldering afm's etc. I would pressure test for leaks, if thats all good I would start looking at your fuel system. 1000km old fuel pump... Started doing in the last week... Id be checking that out.

Edited by GoHard
agentx Rising Star

agentx

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Just finished a diagnostic - it was 55 (all clear) but surprising find ... when i took the ECU out, the light wasn't actually on till I played around with the adjustment screw! In the r32 (Type M), the EGT acts as the check engine light (confirmed now) so when I turned the ignition on, that EGT light wasn't actually turning on (and obviously the LED wasn't either)...

What could that mean? Anyway i adjusted the screw after the diagnostic and made sure it (as well as the EGT) was in a constant ON position before i put the ECU back in.

Did a ecu reset (by disconnecting battery) and went for a spin and now its a bit better but still definately hesitating on certain RPMs across the range, its more like a flat spot now but once it takes off ... it takes off. Next is to test fuel pressure and then AFM.

Its so frustrating, I've called numerous workshops and asked that i JUST want to check fuel pressure but none of them want to do it, they all say drop the car off and leave it and we'll diagnose the issue etc etc. I don't want that, ALL i want is to check fuel pressure dammit! might buy a gauge and do it myself lol

  • 3 weeks later...

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