After my misfire last week I changed the spark plugs and replaced an injector that turned out to be duff.

 

Now, I have a slight misfire that only happens on very light throttle. If I press the accelerator pedal to the floor the misfire clears up but then when I am back to light throttle like when cruising the mis comes back.

 

I can get it to misfire in neutral too by bring the revs up slowly.

 

What should I be checking now?

 

Thanks, Dan

Try wigling the temp sender at the front of the engine. I what seemed to be a mis-fire and it was that. Would be worth checking some other stuff though too, like whether the connectors are clean and the TPS etc is set right

Might be worth unplugging your MAF sensor too (under nose cone).. See if it stops the misfire then? could be a leak in your vac system.

Cheers guys, will investigate this afternoon.

Should the throttle position sensor need adjusting after replacing spark plugs and an injector, it to me ages to get it set up right last time. Also, checked all my connections and all are clean, clean enough to be working anyway. I also disconnected the maf sensor and it was misfiring really really bad, almost undriveable..

Oh that's interesting - if I unplug mine it runs smooth as anything!... Maybe something to do with it?!

Hmm, I have a bee r rev limiter, when the handbrake light is on the limiter comes on a 2500rpm, when my maf was unplugged the limiter came in at 2500 rpm!? And I treble checked my handbrake wasn't on.

 

After driving it again this evening it's definatly a hesitation on light throttle and I can definatly get it to clear as soon as I press the accelerator a little more..

I believe unplugging maf will always send it into limp mode and stop it going over 2.5

What map is it running? Standard ECU chip?

It's running a mines ecu, has been for past 4 years now. It was running perfect, since this new injector and new spark plugs have gone in the hesitation has come, the connector is a bit dodgy on the injector so going try source a better one Tomoro from a local scrappy that has a z in, if the connection is loose would it cause a hesitation? Or, would it cause a permanent mis? :s thanks

It could cause it to mis. A few people use cable ties and tape etc to keep them on although I wouldn't necessarily recommend it.

 

Might be worth trying a boost leak test.

 

Do you know anyone in your area with a conzult or something similar?

No I don't , to update, it definatly only on one bank, all 5 injectors tested between 12.8 and 13, one tested 120!?? Also, removed the plenum tonight and it looks like the gasket has been broken up for some time and had silicone on to repair it.

 

I am now thinking, when I replaced my injector, we moved the plenum over slightly to aid us getting to both screws so could of disturbed the plenum seal, also, it's odd that just one inject on the multi meter read so high!??

It tends to indicate that injector has failed.

Something, unless my replacement injector was already faulty is causing these injectors on this particular cylinder to fail, could the replacement clip be on wrong? I imagine there is no right or rlwrong way for the two cables!? Or maybe something corrupt in the ecu??