griffith overfueling
Discussion
Get yourself a noid light and see if it's the same problem I had when one bank of injectors was on all the time and flooding the nearside bank.
Had this fault on and off for about 6 months and finally found a short on the wiring loom where the loom comes up from behind the plenum.
It tended to happen after stopping for 15 or 20 minutes and then on restarting would run on only one bank. Had the most pungent exhaust smell as well. Once running properly though would produce a cloud of smoke for the first 30 seconds from the unburnt fuel in the exhaust manifold.
I was sent up the garden path by a local indy would said it wasn't the injectors but the ignition amplifier and after replacement the fault reappeared after a week or so.
I eventually made myself a noid light and plugged it in when the fault occurred and found the nearside bank was switched on and not flashing.
Maybe worth checking the exhaust manifold temperatures if the fault occurs from cold.
Paul.
Had this fault on and off for about 6 months and finally found a short on the wiring loom where the loom comes up from behind the plenum.
It tended to happen after stopping for 15 or 20 minutes and then on restarting would run on only one bank. Had the most pungent exhaust smell as well. Once running properly though would produce a cloud of smoke for the first 30 seconds from the unburnt fuel in the exhaust manifold.
I was sent up the garden path by a local indy would said it wasn't the injectors but the ignition amplifier and after replacement the fault reappeared after a week or so.
I eventually made myself a noid light and plugged it in when the fault occurred and found the nearside bank was switched on and not flashing.
Maybe worth checking the exhaust manifold temperatures if the fault occurs from cold.
Paul.
Check the plug colours on both sides, as each side is fueled independently (assumming you have catalysts). If the fault is on one side only (4 black plugs) it likelty to be HT (a misfire will make the ECU put in to much fuel) or lambda probe on one side. Other wise ,in addition to whats been said already an open circuit temp sensor, or faulty AFM can cause overfueling.
I had a (supposed) overfueling prob until I've swapped in a set of injectors from the Ford Mustang, they're advertised as having a better spray pattern and infact the engine since then goes smooth like thai silk and its torque is much more robust without blinding my eyes with unburnt fuel fumes...
They're a bolt on application.
They're a bolt on application.
To be honest a noid light is not going to tell you if an injector is open all the time,( as in stuck open) as firstly the four injectors on each side are fired together on the same circuit, and they have a constant 12 volt (ECU regulated however) feed on one side, and are switched to ground to make them open. If you lost one of these circuits then the engine simply would not run with 4 pots out. It could tell you however if the wiring loom was broken to an injector so it would not open. Likewise it could tell you if the ECU loom was shorted to ground, but with 4 injectors stuck open the engine I hate to think of the consiquencies! (Im suprised pauls engine would even run with 4 injectors squirting in all the time) I would not go down this route before you look at the plug colours, they will tell you a great deal more
Edited by blitzracing on Saturday 6th February 17:25
Mark,
Believe it or not it did run on only 4 cylinders and surprisingly not as bad as you would expect.
Did stink to hell as you would expect and probably has knackered my cats pretty much.
It was noid the light that finally told me what was happening and from that was able to find the fault. Obviously it won't tell you if the injector is sticking mechanically however.
Cheers.
Paul
Believe it or not it did run on only 4 cylinders and surprisingly not as bad as you would expect.
Did stink to hell as you would expect and probably has knackered my cats pretty much.
It was noid the light that finally told me what was happening and from that was able to find the fault. Obviously it won't tell you if the injector is sticking mechanically however.
Cheers.
Paul
Gassing Station | Griffith | Top of Page | What's New | My Stuff