Rb25 Pinging Like Buggery

[Bluprint]

I've done a search on pinging topics and I've gotten some info back, though no one's problem seems to be exactly the same as what I've got here....

Well i'm fairly sure I've got a bad batch of fuel (Very bad batch)

I filled up with BP Ultimate (Use nothing else) on Wednesday arvo, and on Friday morning as I left home for work the engine started pinging it's tits off. This is after about 100km of driving since filling up. I managed to get myself to work with some careful driving to avoid it pinging, though I noticed that once the car was at full operating temperature the pinging stopped completely and I could drive it normally.

Though in the afternoon driving home (still very carefully) It didn't ping at all until it got to full operating temperature, and not as much as before.

I spent the whole afternoon trying to sort it out, it's got a new fuel filter and a bottle of octane booster in it, the tank is about 2/3 full now.

Now it will still ping, about as much as it did yesterday. Doesn't seem as though the octane booster has made much of a difference. (Although I've only driven about 5-10 "testing" kms since it was put in, I guess that's probably too early for it to take effect. I've never had to use booster before so I don't know how long it takes)

When idling it purrs like it always does, the car drives dead smooth, I don't know if it's losing power as I'm certainly not game to give it a boot. It's not misfiring/running on 4/5 cylinders.

It seems to be most suseptible to pinging if I'm only applying the lightest amount of throttle (5-10% let's say). That being said, I haven't given it anymore go once it starts, I just back off straight away.

It doesn't need any boost or hard driving to start pinging.

Any ideas? I'm not really in the mood for buying another neo.....

Drain fuel tank?

Could this be the result of fuel companies toying with ethanol mixtures as mentioned in the news?

Edited September 24, 2005 by Bluprint

[blind_elk]

While you still have some of that tank-load of fuel, take a sample (about 1 litre) so you can get it tested. Then you can throw the results at BP, if that's the problem.

[Abo Bob]

Have you checked your timing? Maybe your cas has come loose.

[Bluprint]

I checked that yesterday, seems to be as it always was.

Bolts were tight and the markings still lined up.

The more I think about it the more I seem to think that my fuel pump is dying....Bosch 040 7000kms old? Not likely huh......

Perhaps running the tank low did it, because trhat's all I can think of.

[Abo Bob]

If you are thinking fuel starvation, pull the return line off and point it into a tin to make sure there is fuel getting through.

Maybe a connection at the fuel pump came loose. It happened to me but it came completely off and wouldn't start.

[Bluprint]

ok, a friend and I spent most of the afternoon on it

we drained the fuel out and put new fuel into it...... it's still pinging.

Pulled the plugs out, they look fine and are the correct gap. Not black and not white.

It's off to a workshop tomrrow.

Edited September 28, 2005 by Bluprint

[Bluprint]

Problem sorted!

f**k me...... check this shit out

At the point where the wiring loom was cable tied to the firewall, apparently there was one wire which was unshielded from when the engine conversion was wired up, the wiring loom was spliced in at that point and it was never covered up afterwards.... this was a wire for one of the knock sensors. Because it was unshielded it had started to come into contact with the body of the car, giving the sensor a false signal that there was pinging occuring within the engine.... causing the engine to act "accordingly", thus causing it to ping for real.

I guess it pays to have a shit hot auto electrician ;D

[Abo Bob]

Well I don't think I could have guessed that one . Good to hear it's all good now.

[NathR32]

Good to hear it's all sorted Mark

Nath

[Duncan]

sorry I don't see how a knock sensor fault can introduce pinging......if it detects knock the ECU pulls timing and richens the AFR to ensure it does not ping?

It may have fixed your problem but if so your problem was not pinging

[Sumo]

Duncan, I would have suggested the same thing.

Unless, your earthing the signal the Piezo Electric sensor is producing, thus the ECU detecting no pinging, and advancing the timing?

Cheers

Matt

[race_snooze]

sure it wasnt the girl you picked up at the D&D mark.

Good to hear its fixed but