r33 running like a lumpy V8 :-(

[PJ]

last night i had a few ppl in the car and was accellerating when it began slowing down no matter what i did. The turbo is spooling up, there are no warning lights and oil pressure is good. The car sounds like a V8 with a lumpy cam, is really hard to start and causes the lighting to slightly pulse. Everything else is working ok. The car is a 95 r33 gts25t auto. suggestions anyone?

[strutto]

Coil packs?

[PJ]

How do i check them?

[EnricoPalazzo]

water in engine?

[Bobjones]

Sounds electrical, if you don't know how to check them go to someone that does. You will need to check the impedence on the coil packs and you require a metre to do that...

Its not as easy as removing one at a time to check like on a non-coil system, however it can be done but if you zap yourself, then all I can say is that you have been warned, safest bet go see an auto electrician.

I would not do this if you DON'T know what your doing, the post below describes how to do it, however make sure you DO NOT have the leads near anything otherwise you WILL cook your ECU, ignition and maybe some hair!!!

[blind_elk]

How do i check them?

You'll need to remove the cover between the 2 rocker covers. This will expose the coil packs on the spark plugs.

With the engine idling, disconnect the plug from each coil pack in turn. The one where there is no difference to the running of the engine is the faulty one.

Move it to another cylinder, then repeat the process. If it occurs on the same coilpack, it's the coilpack that is faulty. If it still occurs at the same cylinder, it's either the spark plug, or the ignitor module.

[PJ]

It turns out after pulling it all apart that all but 1 spark plug was completely crispied, ie no arm and no head. Got 6 new NGK iridium spark plugs, but a bit cracked off one of the plug when i was putting it in. Its still running a bit weird so im thinking that the fuel pump is really on its last legs, will get a pressure guage on and see whats going on.

[Cubes]

I wouldn't be putting in a plug that has a bit cracked off it. If its the part that is inside the engine then you can damage the bore, piston, head, valves and most definately the turbos ceramic exhaust wheel on its way out.

I've always ran coppers as they are cheap and do the job just as well with a little more reliability at high boosts.

I run BCPR6EY. They are gapped to .8mm from factory and are a V-groove plug. The BCPR6ES are the same plugs but with a standard electrode.

I have noticed the standard's arn't as good so if you do decide to get some coppers get the V grooves.

If the BCPR6EY arn't available get the BCPR6EY-11 which are gapped to 1.1mm, gap them down to .8mm your self. The plugs are $3.50 each.

Be very carefull your car isn't running lean. I had a scare once when I disconnected my inline Bosh910 pump. I gunned the car and noticed it did feel like it picked up better but the temp guage started to go upwards?!?! WTF I thought I then heard pinging in third gear which was rather bad. I pulled over and the car sounded like it was running rough not quite running on 5 but almost there. I took off easy drove it home, the roughness smoothed out and the engine turned out ok. Connected the pump back up and all was ok and my foot was flat to the board again.