92turbo964

I have a 1992 964 turbo w/ 45k miles. Under heavy loads, I experienced significant misfiring w/ engine running rich. I have changed fuel injectors and thinking of installing new sparkwires. Question: Any suggestions for the cause of the misfiring and what sprakwires should I install?

nathanUK '81 930 G50

Did you replace the plugs ?

Staffan

Could be a problem with the WUR (Warm Up Regulator), do a search and you will find lots of information on sympthoms and how to diagnose it.

straight6

Can be one of a few things: The first place to look is bad or old gas. Next is the cap and wires.
O2 sensor could also be bad which might make the car run rich and foul the plugs.
I believe that there is also a sealed ignition/electrical box that should be checked.
I would start with the gas...
Good luck

92turbo964

WILCO

I dont believe its the gas. I have changed out the injectors and will proceed with change out the plugs and plug wires. Regarding plug wires, any recommendation for a manufacturer?

Please keep the comments coming - I will investigate all options.

Miles965uk

Keep all the ignition components stock for a stock to mild engine.

I would just seriously check conenctions from the EZ to the coil then each of the plugs including the cap. If its less than perfect inside the cap then replace it.... cheap as well

nathanUK '81 930 G50

Do the rotor arm as well if you change the cap.

maverick

I had similar issue a few years back and it was the end of one plug wire. The connectors are slip on and one of mine was loose. Found this after a week of dismantling the CIS etc. I put factory issue wires back on.

92turbo964

Thanks all... I will provide all the information to my mechanic and see what if we can the situation resolved.

Turbohead

Also check that both fuel pumps are operating car will rum on one pump but wil break up underload by not having enough Fuel........check the relays and fuses.
Elliot.

Staffan

Good point!

92turbo964

Thanks for the updates.....
All points are great. I think my mechanic is going to have a field day w/ all the checks...has anyone installed Magnecor spark wires?

911 2

magnecor leads are very good i think they come in 8.5mm and 10mm thick with life time guarantee

92turbo964

Which size for this vehicle...8.5 mm or 10mm...also, any other recommended manufacturers?

911 2

the bigger the betternormally its the leads they can break up under lad could also be be the boost blowing the spark on the plugs normally happens if the plug gap is to large