What Be The Problem Here?

[dangaz]

My 1993 gts-t rb20det of late has been experiencing a miss. It won't happen on every stroke, so I assume the plugs are still good NGK (which they are).

I'll be driving at say 3000rpm, then the tacho will sling shot down to 1500 and back up ahain very quickly.Some days it won't occur at all.

I went to the local performance mechanic and he had a look at the coils and ignitor and all seemed in order.

He suggested to go for a quick spin to see if he can find the problem....turned the key ....no-go.

So to cut to the chase.....

What do all the RB gurus think is causing the intermittent miss???? and why wont it start now????

I'm assuming the loom to the ignitor has been damaged by heat soak. Am I up for big $$$ or little $$$

Cheers Dan.

ps I have searched, but every miss issue seems to be upper end balls to the wall.

[SpeedyJ]

Hi Dan,

Normally when the RPM glitches the problem would be caused from the cam sensor. Intermittant faults are not uncommon with these sensors, but I wouldn't order anything until the problem was diagnosed. If you're in Sydney we have a scan tool at our workshop that can read the codes off the factory Nissan ecus which does solve a lot of problems quickly. It also has other diagnostic functions for identifing fuel, ignition and timing problems down to each cylinder.

Regards,

Jeremy

Tweakit Performance

http://www.tweakit.net/

[dangaz]

Thanks for the reply Jeremy. I'm living in the sticks 2.5hrs from the northern beaches so it would be a bit of a journey.Do you think the randomly occuring miss and non-start now are one problem or maybe two?? I've never heard of that sensor before, I didn't mention the ecu is chipped not sure if this has anything to do with it.

come on guys any feed back is great....I don't like walking.