Slight Lope At Idle

[OBS96]

I've got a very slight lope at idle, then it will idle fine for a few seconds before it lopes again. When it lopes, the RPMs drop 20 or 25 RPM. A fouling injector? something else? Any help would be much appreciated. Also, is there a way to disable the governer without chipping it? I will be chipping it before too long, but if I can squeeze a little more power out of it by doing this, I would. Thanks

 

[95_stroker]

Youre idle lope could be the IPR valve o-rings. If so, the rough idle should be worse when hot and the oil is thinner. How high are you revving it? I think the factory RPM limiter is somewhere around 3200-3400 or so. That is a PCM function so your only option is programming via a chip or hand held programmer like the SCMT or such.

You do have some dime store options available for increasing your horsepower like shimming the FPR to get your fuel pressure higher and doing the 10K mod which increases your injection pressure. You can get an aftermarket intake or build your own DIY intake and opening up the exhaust helps also. If you are going to mess with the fuel do yourself a favor and get a pyrometer installed first so you can monitor your exhaust gas temps.

 

[OBS96]

I put a 1.0 A/R turbo, A 3"downpipe' and a Magnaflow stainless 4" flowthrough exhaust, no CAT.I'll be puttin a Tymar intake, and filter on in about a month. What is the 10K mod? Any threads for how to's on both mods?

 

[95_stroker]

10K mod

DIY intake

FPR shim...

Take the large bolt loose on the side of the fuel pressure regulator located on the side of the fuel filter cannister and pull the spring and spool valve out. You can take a BB and place it behind the spring (just compresses the spring a hair more is all) and reassemble it. Or you can buy a small machine screw and a brass nut, round the hexes off the nut so it can slide in the spool smoothly, now you have an adjustable device. You are looking for 70-75 psi of fuel pressure. There is a schrader valve on the side of the FPR where you can check your fuel pressure with a gauge.

 

[OBS96]

95 stroker

Thanks Man! That's an easy mod I'll be doing.

 

[OBS96]

95 stroker

How am I adjusting it? By turning the bigbolt with o-ring on it? Thanks

 

[95_stroker]

No, if you go with the machine screw and brass nut you still pull the big nut with the o-ring out to adjust it. You will just thread the brass nut down the thread shank a hair to compress the spring more.

 

[OBS96]

95 stroker

Gotcha, Thanks Man! I really appreciate the help.