Rich Idle
 

I just recently swapped from TBI to TPI. The throttle response and over all power are great. The only problem I am having is a rich idle and it sort of stumbles at idle. the RPM will bounce around a little bit between like 650 and 750 RPM, while idling. The TPS is set at .5 volts and there are no vacuum leaks anywhere. Can someone give me any reasons as to why i have a rich, stumbling idle?

What is in your engine? What prom calibration are you running? Have you tuned the chip AT ALL?


Brendan

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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

To see the ROC, Check out the webpage Here

It is a 355 with around 10.5:1 compression. World Products heads with 2.02/1.60 valves. Comp Cams 08-304-8(i think thats the right number). ported plenum, SLP runners, Edelbrock base, and 22 lb injectors and stock PROM. I know i need some PROM tuning, but i was wondering if there was another reason for it being rich

Every modded (seriously like a cam or something) TPI car I ever saw with the stock prom had a rich idle, and a rich top end. Get a 'custom' chip and kiss the probs away.

(Sounds like you have a kick *** combo too with a good chip..)


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'88 Camaro RS 2.8L
'88 Formula 350 (Too many mods to list...)

If you get a cam or anything like that, what you need is a fuel pressure regulator. They are about $60 in Summit catalog. That way you can adjust it to run with your cam or whatever. I haven't got one yet(no money), but, it will be a good investment.

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1988 Iroc-Z
L98 350 TPI
700R4 Tranny
2.77 gears(will change)
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Mods: Crane CompuCam, headers, gutted air boxes
Best e.t.: 14.49@95.5mph
60ft.@2.27(was 2.12 w/o cam)