Whipple Indicator Light and Service Engine Soon Light
Thread Starter
Teching In
Joined: Mar 2003
Posts: 19
Likes: 0
From: Longview, Texas
Whipple Indicator Light and Service Engine Soon Light 2001 Chevy Tahoe 4x4 w/ Whipple Supercharger: This morning I jumped in the truck and started it up. The service engine light stays on (not blinking). I listen to the engine from inside the truck and out. Nothing sounds out-of-the-ordinary. I figured that my O2 sensor is bad or something like that. I planned on taking it by the dealership after the Memorial Day weekend.
Well, this evening I'm cruisin' back from the movie with the wife when I notice my Whipple exhaust temp. indicator light start flashing. I'm cruisin' on the back streets at a solid 35mph. I shouldn't be seeing this thing acting up.
Does anyone care to guess what's going on? Bad catalytic converter? Bad O2 sensor? Something more?
Again, the engine is purring.
Well, this evening I'm cruisin' back from the movie with the wife when I notice my Whipple exhaust temp. indicator light start flashing. I'm cruisin' on the back streets at a solid 35mph. I shouldn't be seeing this thing acting up.
Does anyone care to guess what's going on? Bad catalytic converter? Bad O2 sensor? Something more?
Again, the engine is purring.
did your whipple come with an exhaust temp sensor? i know some did i think most just look at the 02's.
my guess would be an 02 reading that the pcm and whipple computer doesn't like. could be a bad 02 or something else causing the 02 to read lean.
you need to get a scan tool on there and see what they are reporting, if just one is not switching or reading funny then you cna swap it with the other one and see if the problem changes sides. if it swaps sides with the 02 then it is the 02. if not then it is something else.
my guess would be an 02 reading that the pcm and whipple computer doesn't like. could be a bad 02 or something else causing the 02 to read lean.
you need to get a scan tool on there and see what they are reporting, if just one is not switching or reading funny then you cna swap it with the other one and see if the problem changes sides. if it swaps sides with the 02 then it is the 02. if not then it is something else.
Well if yours does have the actual temp sensor (Mine did) then I would have to say plugged cats or something related,but you should be able to tell by how it runs (very shitty). So if it runs good I would go back to an bad O2 causing the fuel mixture to be off ETC... Two if it does not have the sensor I would have it scanned to find out what all the codes were before I wasted any more time doing anything else cause there is no telling O2 are very comon though. Good luck!
Thread Starter
Teching In
Joined: Mar 2003
Posts: 19
Likes: 0
From: Longview, Texas
Figured it out Voltage reading on the throttle position sensor was outside of parms. Replaced for 60 bucks. Everything is good to go now. It doesn't explain my funky whipple indicator light activity last night, but it explains some other curious behavior, as of late.
I have recently noticed idle surge when I've started the engine cold. In addition, the tranny has been holding in first too long when cold. I am aware of the tranny heat-up programming, but this was above and beyond the normal cold running hold. It's amazing how important a little dinky sensor is in today's advanced truck engines.
Thanks for the thoughts fellas. Also, thanks to the guys at the Tune Up Clinic shop in Smyrna, GA for hooking me up.
I have recently noticed idle surge when I've started the engine cold. In addition, the tranny has been holding in first too long when cold. I am aware of the tranny heat-up programming, but this was above and beyond the normal cold running hold. It's amazing how important a little dinky sensor is in today's advanced truck engines.
Thanks for the thoughts fellas. Also, thanks to the guys at the Tune Up Clinic shop in Smyrna, GA for hooking me up.
Staging Lane
Joined: Jul 2002
Posts: 90
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From: Mechanicsville, VA
That whipple MIL monitors more than just the EGT's. It also monitors the TPS signal(your problem) and other hookups to the piggyback system. Since you have fixed the TPS problem then you have cured both your SES light problem with the truck PCM and the Whipple computer at the same time. I had this happen to me once with my Whipple so I speak from experience. If you notice the Whipple MIL doesn't just blink once or twice it blinks like morse code so a code 16 would be a single blink then a pause then six more blinks. You need your whipple directions to get the specific codes that their computer can give. Hope this helps and I'm glad that its running o.k. now.
