Bad Idle, I have lots of data that may help. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Def · 06-19-2008, 07:31 PM

Unfortunately, the cold start map for stock injectors doesn't suit larger injectors well, which I think is part of the issue you're seeing.

Do you have your O2 sensor hooked up, and is it starting to function properly by the time you see the RPMs start dipping?

I'm almost positive this is an AFR related issue, and the roughness you're feeling are lean misfires.

You wouldn't happen to have a wideband or access to one for this would you? It's the most important gauge IMO, and I think it'd tell you a lot about what the ECU is doing.

1slowS13 · 06-19-2008, 07:43 PM

Quote:

Originally Posted by Def

I'm almost positive this is an AFR related issue, and the roughness you're feeling are lean misfires.

Maybe your fuel pump strainer is clogged? Could be as simple as that.

06-19-2008, 07:31 PM	#1
Def Post Whore! Join Date: Apr 2004 Location: Houston, TX Posts: 2,701 Trader Rating: (16) Feedback Score: 16 reviews	Unfortunately, the cold start map for stock injectors doesn't suit larger injectors well, which I think is part of the issue you're seeing. Do you have your O2 sensor hooked up, and is it starting to function properly by the time you see the RPMs start dipping? I'm almost positive this is an AFR related issue, and the roughness you're feeling are lean misfires. You wouldn't happen to have a wideband or access to one for this would you? It's the most important gauge IMO, and I think it'd tell you a lot about what the ECU is doing.