Surprise Surprise Misfire
Discussion
Every car I have ever owned has had a misfire its the bain of my life! And because of my lack of knowledge of electrickery its always electrical.
But this time I'm running out of ideas.
It is at its worst at 40mph in 4th gear, somewhere between 1'000 rpm and 2'000 rpm on light throttle.
I cant quite make out if it still does it when it goes full loop, but it does feel down on power.
All plugs are black with carbon, not oiled up.
Up to now I have changed:
Plugs
Leads
Rotor arm
Dizzy cap
lamba sensors
ECU temp sensor
Cleaned the idle control valve thingy and made sure it moved.
Im thinking of looking at the injectors next?
Any ideas?
Would the ECU fault reader thingy help me?
But this time I'm running out of ideas.
It is at its worst at 40mph in 4th gear, somewhere between 1'000 rpm and 2'000 rpm on light throttle.
I cant quite make out if it still does it when it goes full loop, but it does feel down on power.
All plugs are black with carbon, not oiled up.
Up to now I have changed:
Plugs
Leads
Rotor arm
Dizzy cap
lamba sensors
ECU temp sensor
Cleaned the idle control valve thingy and made sure it moved.
Im thinking of looking at the injectors next?
Any ideas?
Would the ECU fault reader thingy help me?
There are some instructions on how to check the meter on the rpi website
under
"Setting Air Mass/Flow Meter & Throttle Pot"
On this page http://www.v8engines.com/carbs-2.htm
under
"Setting Air Mass/Flow Meter & Throttle Pot"
On this page http://www.v8engines.com/carbs-2.htm
I did think it was shunting at first but its been getting worse, now it defiantly feels and sounds like its running on 7 at times.
I have tried an injector cleaner.
Would it be the worst thing in the world to unplug the MAF and try it down the road? And if I did what would it tell me?
If it still had the problem then it might be an air leak, or a spark problem.
Thanks for your help guys, I'm very quickly getting over my head with the electrics.
I have tried an injector cleaner.
Would it be the worst thing in the world to unplug the MAF and try it down the road? And if I did what would it tell me?
If it still had the problem then it might be an air leak, or a spark problem.
Thanks for your help guys, I'm very quickly getting over my head with the electrics.
A lot of TVR plugs run black- especially if the cars are round around town all the time, it could simply be a case of running a slightly hotter plug to allow the carbon to burn off- This is nothing to do with the spark at all, its down to how quickly the plug tip conducts the heat away during the mixture burn period. If the engine is genuinely running rich for any reasons like an AFM being out of spec' the either RoverGauge or the ECU mate will show the lambda's are not switching as they should, but these ECU (fuel only) tools cant really do much with the ignition side of things. The ignition system really needs an old fashioned Crypton tuner with a display of the HT voltages on a scope if you want any meaningful data. If its a nasty snatch under light engine load at around 1700 rpm in higher gears, that goes the moment you give it more gas- that sounds like shunting.
Been doing a bit of reading and it does sound a little like the shunting problem.
But I'm sure it wasn't doing it before, and its quite a bad misfire/shunt. Its bad enough cause drivetrain damage.
I think I need someone with a Chimaera to drive mine and tell me if its the dreaded shunt.
But I'm sure it wasn't doing it before, and its quite a bad misfire/shunt. Its bad enough cause drivetrain damage.
I think I need someone with a Chimaera to drive mine and tell me if its the dreaded shunt.
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