I have a 2000 lightning with JDm chip and single bore throttle body. The truck runs between 1000 and 1500 RPM's Before with the stock throttle body and R9 chip the truck idled at 650-700 rpm range. Is this normal, Also the truck sat all winter, Any Ideas?

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2000 F-150 4x4 Super Cab Oxford White Short box. Piaa Head light clear Front turn signals bulbs,5.4L,3.55ls, Superchip,Borla exhaust, K+N.. More to come.


2000 SVT WHITE LIGHTNING...
JDM PROGRAM chip
90 MM Mass Air Meter
Single Bore Throttle body
JDM Driveshaft,12" Cone Filter,2001 Headlights,tailights,turn signals, and center stop lamp.
Piaa head lamp bulbs
Precision Power amp PC4400
Pioneer 6x8 #TS-A6865 3-ways
Pioneer DEH-9200 Deck with Pioneer 6 disk. bassinni cat pipes and cat back.
Perma-tech sprayed in bedliner.
drop shackles
JL Ram Air Kit
JL Drive shaft loop
Lo-tek 3 guage pod for pillar.
code alarm with auto start.

 

Mine would idle around 1000 rpms when cold, but once it gets warmed up, and fed with a few kills, then it happily idles at 600-700 rpms, digesting the fbodies...

no muffler, no chip....but you knew that.

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99 Black Lightning! Kills! kills2! kills3 spring01 kills4 kills5
factory tonneau cover, 100k mile warrantee, Line-Xed

2.145 60' 8.789@82.71 (1/8) 13.603@101.05 1/4 track straight pipes, 'Major' rear lights, no chip
Another intercooler sign in...(Everyone please) Pages: 1 2 3 4

 

You need to adjust the gizmo on the side of the throttle body, the throttle position sensor. Just slighty loosen the two screws and rotate it. The RPM's will go up or down depending on which way you rotate it. After you've adjusted it correctly, the idle will be better and the shift into 2nd gear won't occur at such a low RPM.

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Regards,
George
george@spikeengineering.com
http://www.spikeengineering.com
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Red 2000 Lightning, #4033

White 1996 Whippet (600 yard course, 6 turns: 40 Seconds)
Red Wheaton 1995 Ridgeback (1/2 loaf of bread, 6 bites, 4 seconds)
New addition:
2001 RR Puppy: 0 to stumble - next two months

 

What should you set the TPS voltage too? .98 ???????

 

Cobra,

I ran into this with mine too. I noticed the throttle blade looked to be open way too much. I centered up the tps switch between the screws and then adjusted the little bolt on the stop arm until the tps voltage was .96 volts. This way the voltage is safely under the 1 volt maximum at idle and the throttle blade was just barely open, which allows for the computer to do automatic adjusting to the idle speed via the idle air compensator valve. (at least that's what GM calls them) That returned everything back to normal. Had my voltage still not been correct, I would have tweeked the tps switch, but I didn't have to - it was perfect when the screws were centered in the switch's indentations.

How to adjust the TPS switch

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Jim
Black '00
#1,757 built 3/30/00
Clear corners
JDM street program
JDM 2# blower pulley (ordered)
J.L. Stage II ram-air
FRPP Oval throttle body
90mm MAF
MagnaFlow Exhaust

[This message has been edited by gforce (edited 04-20-2001).]

 

I tried the throttle stop and the TPS No Luck... Don't know what to do now.

 

Cobra99,

Well, I'm just guessing now, but did it start doing this exactly when you put the T/B on? If so, either the gasket isn't sealing correctly, the linkage is holding it open some, (try taking the throttle linkage loose and leaving the spring attached) or your idle motor isn't working properly. Maybe try resetting the computer by pulling the neg battery cable and turning on the lights for 1/2 hour.

I'm sure you checked, and I'm just trying to help you, but are you sure the T/B blade isn't too far open? I had to turn mine about 3/4 turns clockwise (from the top) to get it right.

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Jim
Black '00
#1,757 built 3/30/00
Clear corners
JDM street program
JDM 2# blower pulley (ordered)
J.L. Stage II ram-air
FRPP Oval throttle body
90mm MAF
MagnaFlow Exhaust

 

I had the same problem. .98 volts and it purrs like a kitten!

Jeff

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Silver 00
3/4 Drop
Snuglid
Stongard
JL ram-air
Oval-Bore T/B
01 Meter
JDM chip

 

I did all that. JDM said the same thing. I noticerd it when I put the throttle body, JDM chip and 90 MM meter on. I did it all in one shot. I did not drive the truck for 6 months. Do you think it could be bad gas making it idle high? No check enging lights.

 

Bad gas can create all kinds of problems, but I doubt that's your problem because usually they just run rough or don't start well until it's all gone. Try to use it up and refill.

Another very strong possibility is your Idle Air Control Valve is sticking open. My Chevy truck did that and I darn near couldn't get it to come to a stop at a light. Peck on it and see if it closes and returns your idle back to normal.

Since you say it started all this at the same time you put the mods on, this would be another great possibility. Either your chip isn't quite right or maybe the MAF is just a dud. Disconnect your battery and pull the chip. Then drive it and see what happens. Just don't get on it really hard. Mine runs perfectly without the chip, but with the 90mm MAF, but in the long haul is probably too lean. Jim at JDM told me I could drive it without the chip when I sent mine back, so try it and see what happens.

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Jim
Black '00
#1,757 built 3/30/00
Clear corners
JDM street program
JDM 2# blower pulley (ordered)
J.L. Stage II ram-air
FRPP Oval throttle body
90mm MAF
MagnaFlow Exhaust