hey guys

my 92' deville speeds up by itself and i won't even have my foot on the pedal.. and when i step on the brakes, i hear the engine in real high rpm..
what could be the problem? i dunno much about cars and i'd REALLY appreciate some feedbacks.. thanx

hey guys

my 92' deville speeds up by itself and i won't even have my foot on the pedal.. and when i step on the brakes, i hear the engine in real high rpm..
what could be the problem? i dunno much about cars and i'd REALLY appreciate some feedbacks.. thanx

try this: go to your climate controll panel and push the on and warmer buttons while the key is in the on position, car not running. look at your fuel data center and take note of the numbers. write them down and post them here. the numbers will look something like this: e052 and so on. again, write them down and post them here.

k.. the numbers shown are
888 E E22 E39 E52 E70 E91 E98 .7.0

(i didn't see any "on" button so i pressed "off" and "warmer" simultaneously)

k.. the numbers shown are
888 E E22 E39 E52 E70 E91 E98 .7.0

(i didn't see any "on" button so i pressed "off" and "warmer" simultaneously)


oops...you are right about the off button. :drinker

e22: throttle position sensor circuit fault. (TPS)
e39: torque converter clutch (TCC) engagement fault
e52: reset, unimportant.
e70: TPS signal fault, intermittent.
e91: park neutral position (PNP) switch or circuit fault.
e98: transaxle shift fault.

i see a pattern here that suggests the TPS is your problem. check the wiring to the TPS first. make sure it is clean, tight, and undamaged. the TPS is located on the back side of the throttle body. there will be a connector directly on top of it. if that does not work out, replace the TPS. before you replace the TPS, make sure you reset the codes on your CC panel by presing the off and high buttons, when they clear, it should read e.0.0. good luck. :cool:

aiight.. i'll try that
thanx illumina

Maybe this will help.
http://www.caddyinfo.com/idlelearn.htm

Maybe this will help.
http://www.caddyinfo.com/idlelearn.htm

ill...it that how it should be done on my car as well? 4.5,is it same thing? seems like a waste of time and gas.

Not sure if it is the same on a 4.5

what's idle learn procedure supposed to do?
sorry.. i really don't know much about cars..

that is definitely a problem with the tps, could be something real simple like the linkage.
im having flashbacks on this one....MAKE THE BAD MAN STOP

k.. the idle learn procedure from that site doesn't work..

My mother is currently having her '93 DeVille worked on for the third time for this problem. Each time it is $70, $430, etc. Why can't the dealership pinpoint this problem since many people are having it? And how do I let them know how to fix problem?

Have you checked the linkage on the tb? Sometimes they get gummed up and wont return to normal position. That will also confuse the tps because the throttle isnt closed all the way. Try cleaning the intake and lubing the linkages. Try the easiest stuff first.

As mentioned, clean the throttle body. Get some carb cleaner and scrub down the back side of the throttle plate and the perimiter of the bore where the plate and bore meet as well as the pivot points. It may just be carboned up and binding (not returning to idle). If that doesn't do it, it has to be TPS (throttle position sensor) or ISC (Idle speed controller).

Ranger,

Do you use carb cleaner or throttle body cleaner? I was told that carb cleaner can ruin the oxygen sensor. Not sure if that was the cause but I did have this same problem a few years ago and carb cleaner in the throttle body did fix the problem. I had to replace the oxygen sensor a few months later though.

It's the same stuff. It wouldn't really matter either, theres plenty of cars with carbs and oxygen sensors.....

Dave is right, same stuff. I use "Gumout" with no ill effects. I suspect your O2 failure was just coincidence. Silicone on the other hand is instant death to an O2 sensor.