bad idle

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Dec 16, 2009 | 08:18 PM

88ROTA

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Joined: Apr 2009

Posts: 54

From: phx,az

Ok i ve had no luck solving this idle issue.

I have a n/a s4 6 port that I had street ported. I can't seem to keep the car from dieing on me if I lower the rpms down under 1200 rpms. Also there are no lights or fans on when this hapens i t will just be ldeing the drop way down then back up then down to the piont of it almost dieing.

I've checked the bac valve by unplugging it and the rpms drop like they should.

The car idle great before I the rebuild. I also hooked up everything back exactly how it was when pulled.

What else could be giving me a bad idle?

Dec 16, 2009 | 08:35 PM

89 Rag

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Joined: Jul 2002

Posts: 2,467

From: Portland, OR

Check/add grounding points, test TPS

Dec 16, 2009 | 08:54 PM

88ROTA

Thread Starter

Member

Joined: Apr 2009

Posts: 54

From: phx,az

Quote:

Originally Posted by 89 Rag

Check/add grounding points, test TPS

Well I checked the ground points 5 time. I'm not sure how to add more ground points. And how do you test the tsp?

Dec 17, 2009 | 10:46 AM

89 Rag

Senior Member

Joined: Jul 2002

Posts: 2,467

From: Portland, OR

Fc Grounding 3800 Rpm Stumble, Etc... - Nopistons Mazda RX7, RX-7, RX8, RX-8 Forums! : for grounding info

Tps - Nopistons Mazda RX7, RX-7, RX8, RX-8 Forums! : for setting/testing tps

These are common problems that have plagued all of us at one time or another

Dec 17, 2009 | 12:38 PM

88ROTA

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Member

Joined: Apr 2009

Posts: 54

From: phx,az

Quote:

Originally Posted by 89 Rag

Well that's what other people are telling mefrom other car formus.

Does this normally happen sence the motor was ported abit and I hooked everything back up the was it was when stock? I mean I really didn't adjust anything. As far as grounds and the tsp.

Let me know please cause today I have to get to emission and I wanted everything normal.

Dec 17, 2009 | 01:30 PM

89 Rag

Senior Member

Joined: Jul 2002

Posts: 2,467

From: Portland, OR

If you exceeded stock parameters and have done nothing to suppliment the fuel and air I would say that is the main problem, yes.

There are all kinds of ways to cause problems after a swap, sensors get dirty just from sitting around, grounds on the harnesses dont get hooked back up, or the attachment points are dirty/greasy. It always helps to take lots of pictures prior to removal and have a manual handy for reference points if you are an amatuer at this type of work.