Misfire, stuttering, pops and bangs?

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BALDYMONSTER
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Misfire, stuttering, pops and bangs?

Post by BALDYMONSTER »

The car has had this almost imperceptible issue for a few weeks now.

The sort of thing you only really notice if it’s your car, if that makes sense? It just wasn’t accelerating as hard and I could feel a bit of hesitation nagging away with the foot down in boost.

Well last week I floored it in third joining the motorway and thought I’d hit over boost. But for the moment the car just farts, misses, bangs after about 3000rpm under load on boost.

It seems to be slightly less prone to do so when the tank is full of fuel and it’s really bad on a quarter tank and under. It had a new walbro 255 fitted after Peter Gidden lied through his teeth, as usual, and fitted a cheap eBay pump for £19 instead of what I’d paid for about 2 and a half years ago.

It’s had new plugs, dizzy cap seems fine and has been cleaned up.

It’s always run on V-Power.

Has anyone else had a similar issue?

I’m leaning towards a knackered pump or dirty fuel filter, but would appreciate others thoughts.

Thanks.


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Re: Misfire, stuttering, pops and bangs?

Post by rgb »

damp in the coil makes them run like that
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Re: Misfire, stuttering, pops and bangs?

Post by simpson_eh »

As above
Check for cracks in the coil had the same symptoms
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Re: Misfire, stuttering, pops and bangs?

Post by BALDYMONSTER »

I’ll take it out and have a look next week.

Still no fault codes showing.

Hope that’s the problem and not the fuel pump.

Thanks for the help.
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Re: Misfire, stuttering, pops and bangs?

Post by MR2madlad »

Do a fuel pressure test on it to identify if pump is weak, might be once the fuel level is lower than pump body its drawing in air by badly made / sealed pump.

Check / replace fuel filter.

Check for leaks on fuel lines.

if you have replaced all the service bits dizzy, arm, plugs and timing is ok the next step for me would be to check coolant temp sensor the green one that reports engine temp to ECU (not gauge) to BGB specs if that is good the Lambda probe would be my next port.

My 94 Turbo had bad Lambda probe and was kangarooing like crazy when warm, from cold ran ok but once hot no guts under 2500 RPM had to keep pressing accelerator then finally it takes off like crazy.

Tested Lambda with gas torch on volt reading on meter end was virtually glowing bright orange 0.0034 volts (best part of FA!) the heater was also open circuit.

Got new one (genuine Denso off ebay which was a genuine Toyota one that had the P/N slightly ground off so Denso sold as a DOX-0216 4 wire, properly left over factory that Toyota didn't buy looked identical even the welds so 100% genuine) warmed that up with gas torch the voltage it stuck out went to 0.8 - 0.9 v quick and instantly dropped to 0 when torch was taken away so old Lambda was fxxxxd.

Fitted the new on, she runs soo much better.
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