I've recently noticed an intermittent problem.

 

Sometimes, following full boost, the car seems to be hesitant, a little juddery, almost as if it's running on 5 cylinder. This sometimes disappears with further driving or on restart. Would a boost leak or a faulty knock sensor cause these symptoms? An ECU test showed no faults. I've checked all accessible connectors and they seem fine as is the series 2 PTU. The engine harness was replaced a few years ago.

 

If this was a constant problem, I guess I would look at the plugs, coilpacks, injectors etc. But this is an intermittent problem but annoying just the same.

 

Any ideas?

 

Cheerz

not much help me...but welcome to the club i guess

I would start by cleaning every contact you can get to with contact cleaner. Your problem could quite easily be a dirty contact or loose connection.

 

Vijay

Welcome to the club, normal things to check would be all connections, pull them apart to make sure there's no corrosion, possible spark plug breaking down under load, cas and maf or coil pack,. I don't think either a boost leak or knock sensor would be the problem.

 

Paul

Agreee with "300 zedx", would not be a boost leak as it is intermittent.

 

Al.

I've recently noticed an intermittent problem.

 

Sometimes, following full boost, the car seems to be hesitant, a little juddery, almost as if it's running on 5 cylinder. This sometimes disappears with further driving or on restart. Would a boost leak or a faulty knock sensor cause these symptoms? An ECU test showed no faults. I've checked all accessible connectors and they seem fine as is the series 2 PTU. The engine harness was replaced a few years ago.

 

If this was a constant problem, I guess I would look at the plugs, coilpacks, injectors etc. But this is an intermittent problem but annoying just the same.

 

Any ideas?

 

Cheerz

 

Mine did this, and i found that although all the injector connectors seemed secure they were not, the metal part of the connector needed queezing to make a tighter fit, car ran much better after.

Thanks guys, all very helpful.

 

Having borrowed a Conzult tonight, the Power Balance Test shows a red on cylinder 6. It's not a large drop compared to the other cylinders but enough to get a red. May be this is causing or contributing to my problem? I also noted that idle display was swinging rapidly back aqnd forth between 750 - 850 RPM. Very erratic on Conzult but not really noticable in the car.

 

Is there a guide to show the optimum readings for all the different data fields in Conzult?

 

I guess I'll have to check the injector and plug on No. 6 to see if this solves the problem or highlights a new one! Trust it to be the least accessible cylinder:(

 

Thanks again.

Mine did this, and i found that although all the injector connectors seemed secure they were not, the metal part of the connector needed queezing to make a tighter fit, car ran much better after.

 

i agree it sounds like a connecter coming loose under load check coil pack connectors too:detective:

Yep, job for the weekend I think.

 

 

Can anyone point me in right direction for a set of optimum readings for all the data fields in Conzult?

 

Thanks