now i got my msd box in and it is ruinnin leaner then Crap!! what is the best adj. FPR to put it? where can i get it ? and how hard is the install?

 

afpr wil not work on your car. you can up it to 100 lbs of pressure and the car will still run lean. the injectors have to be adjusted in the programing of the pcm. if you put the afpr the pcm will adjust the pulse width back to what a/f ratio its programed to see.

you need to make the adjustments in the pcm. to richen it up.

 

I'm not sure how an MSD box would make the mixture lean. What did you use before and after the MSD to measure A/F? You could also route the wiring around the MSD (at least on my car it's just a single plug connector change) to validate the theory.

Dave

 

Very interesting. As was mentioned, changing the FP won't get it.

I wonder if those MSDs really work that well, i.e, multiple spark, better burn, high O2 telling PCM that its running lean. However, if the PCM sees that it is running too lean, it should just dump in more fuel to get back to the programmed A/F.

 

that means i gotta get my fuel maps re done. Is it worth goin to a obd 1 computer?

 

You shouldn't need any reprogramming with the limited mods. The question is, how did you determine it is running lean.... wide-band, OEM sensors, scan of BLM's, etc???? Can you post a scan log?

And an MSD box isn't going to cause it to run lean.

Something doesn't add up.

 

the plugs all the way around are whiter then snow. it used to run realy realy rich.