3200GT Throttle body

[Massa in Perth]

Is the throttle body supposed to emit a continuous high pitched note when you switch the ignition on? Or am i being paranoid?

 

[davy83]

I think it does some times yes, thing to do is, start the engine hear that V8 burble and ignore the whining noise, same process i use with the wife really.

 

[Massa in Perth]

Hope you're right. Means it's not related to the misfire the car developed from nowhere on the way home or the 0x1172 (Throttle pot) error Unidiag says I have.....

 

[highlander]

I think it does some times yes, thing to do is, start the engine hear that V8 burble and ignore the whining noise, same process i use with the wife really.

does she have a V8 burble too then davy?

 

[deano]

Yes does eminate a whining noise,wit.h ignition on

 

[davy83]

I think she might be a two stroke!!!

does she have a V8 burble too then davy?

 

[davy83]

If you have an original throttle body then its likely the source of your woes, best thing is to get a contact-less upgrade done or at least a refurb with new rotary sensors. Misfire can be the ignition modules, these are worth replacing, you can disconnect them while its idling one at a time and try to work out which one is causing the misfire (assuming it does it at idle?)

Hope you're right. Means it's not related to the misfire the car developed from nowhere on the way home or the 0x1172 (Throttle pot) error Unidiag says I have.....

 

[Massa in Perth]

If you have an original throttle body then its likely the source of your woes, best thing is to get a contact-less upgrade done or at least a refurb with new rotary sensors. Misfire can be the ignition modules, these are worth replacing, you can disconnect them while its idling one at a time and try to work out which one is causing the misfire (assuming it does it at idle?)

Yes spot on, will try that tomorrow.

 

[miket]

Insulated gloves and/or pliers me thinks!

 

[Contigo]

I touched the exhaust manifold one day when it had been running for a long time. **** me it took that much skin off my fingers that I had no fingerprints for a month! Never again!

 

[Massa in Perth]

Insulated gloves and/or pliers me thinks!

Actually no. Because each cylinder has its own coil, there is no HT on the cable side. Much better than the Crane Hi 6 electronic ignition setup I had on my old Jensen which could mess you up permanently if you weren't careful...

Anyway, disconnected each module in turn this morning, and idle got rougher with each. Put it back together and then did the pedal pot calibration (new contactless one from Davy83). No misfire. Will have to take it for a longer run that 'round the block but maybe it was a loose connection (groan) because the misfire couldn't have anything to do with the pedal pot, right......?

 

[mchristyuk]

Massa,

I'm pretty sure 0x1172 is Lambda sensor not throttle pot.

So your misfire and 0x1172 are related, it's just a case of which one is cause and which one is effect! If you had a misfire then the unburnt fuel would be clogging up the lambda, on the on the other hand a faulty lambda will cause a misfire...

I'm guessing from your description that one of the coils wasn't seated properly (or is on its way out), and moving it about has sorted it. Now the engine is running cleanly I'd expect a good blast will clean up the lambda and your 0x1172 will go away!

Cheers

Mark

 

[davy83]

Sounds like a slightly dodgey connection or seating on one of the ignition coils, i can't see any way the pedal sensor could cause misfiring! Could be a bad wiring crimp or corrosion on one of the coil connectors? any sign of damage on any of the coil wires? a kinked spot or squashed bit.

 

[Massa in Perth]

Thanks gents. Good spot Mark, Lambdas are new (Nov14) but giving me CELs until last week, see below.

Spoke too soon, misfire is back, particularly under load. I just had all of the valve cover seals replaced as I had oil on some of the plugs and in their wells. Car ran perfectly for a week then the misfire arrived. peered into the plug wells on one side and the oil is back.... not impressed for $1400 considering I got the parts from Eurospares myself.... going to clean it all up again (pull coils from both banks squirt in some WD40 and then blow out with air) and see where that gets me.

I wonder if this could be the problem....

Cleaned up and misfire gone, for now.. at least its not wiring. Phew.

 

[Contigo]

Where did you get with this mate as mine just now has developed on startup and idle what feels like a misfire, it's like the car is not firing on all cylinders and you can feel the car trembling and when you blip the throttle it goes quiet for a split second before picking up revs.

All spark plugs changed by Emblem last month.

 

[Contigo]

I have a misfire on mine under load, only in higher gears at WOT, it hesitates and stutters a little just like a misfire but there are no CEL's or errors stored in the ECU. I have recently had all plugs changed at Emblem and now am thinking coil packs but at the moment am not convinced as there are no CEL's at all and I would have thought a misfire would have been logged as per this thread.

Today removed and cleaned all Coils and checked spark plug gaps and all was good with those. I am wondering if it is a boost leak of some sort?

 

[allandwf]

Mine was a bit like that before I changed for Davys contactless pedal pot. It didn't always throw up errors. Been all good since.

 

[Contigo]

I have one of his pedals already, but must admit it has been doing some weird things like holding revs.

 

[Trev Latter]

Leaving aside the usual throttle body and pedal pot issues, that does sound like it might br an air/vacuum leak on the intake somewhere.

 

[Contigo]

Yes Trev agreed, I have checked everything else and it all seems strong. It's really only when the turbo's are spooled up in a higher gear etc.. Might clean the MAP sensors too.