Question about 1996 Cadillac Eldorado

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1996nourthstar eldirado hard start then surges while idle

96eldarado nourthstar coupe hard to start then surges in park then drives fine wile excel then stalls at brake

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Could be a lot of things, but the fuel pressure regulators break frequently and that causes an extended crank. As a matter of fact, if it were my car, I would just put one on.

Is the " service engine soon" light on? If is, I would start there. I think checking the codes is easy on that year. Turn the key on. Press and hold the "off" and "warmer" buttons on the climate controls until the instrument cluster lights up like a tree. Release the buttons and let us know if there are PCM codes. They are 'Pxxxx' format. If there aren't any, it will say no PCM codes.

It could also have a vacuum leak, or a clogged injector. Something like that...

Posted on Nov 13, 2014

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TRY CLEANING THROTTLE BODY, AND RESET IDLE WITH COMPUTER.

Posted on Nov 10, 2014

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Posted on Jan 02, 2017

dennymulford
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SOURCE: 91 s10 blazer engine surges warm and cold, stalls

tps sencor or maf sencor

Posted on Jan 24, 2009

ifixgms
  • 64 Answers

SOURCE: engine stalling in park and drive.

Just a shot in the dark here. Mikuni carbs were problamatic on that engine. I remember them well. They had internal vacuum leaks and diapragm leaks just like you describe. I dont kn ow if you can get it any more but the fix used to be a new reman carb. they were not rebuildable. But I always wondered why you coul not have a base plate adapter made by a machine shop to adapt any other simpler carb to it? as long as your cfm rating was the same--ya know? Like take a holley 2 barrel off a k-car and adapt it on. Anyway I hope I helped. But that is what it sounds like. Carb replacement. Thanks

Posted on Apr 06, 2009

  • 107 Answers

SOURCE: 1991 Pontiac Sunbird SE sometimes stall after starting

2 possable... bad fuel injector....or leaky intake gasket worst case the intake manafold is craced

Posted on Jul 20, 2009

sscullys
  • 984 Answers

SOURCE: after starting it will idle down.......during the

Sounds like a Dirty IAC ( idle Air Control ) on the back of the throttle body.

You will need to remove the plastic throttle body cover to see it, it is mounted on the back

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2 8mm bolt head ( actually sheet metal screws that have hex heads ) and it will come off.

Take a look at the plunger inside the IAC, to see if it is gummed up, Some throttle body safe Throttle body cleaner should do the trick ( I used 90% isopropyl alcohol and Q-tips to clean mine on my 2001 ).
It should look like this when clean
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I replaced mine after the 2nd time is gave me grief ( seems to happen more often once it starts ) and it was ~ 70.00 at one of the Ford dealers that sell parts online ( tasca ).

Posted on Oct 23, 2010

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SOURCE: idle surges up and down on 1984 cadillac coupe deville

I A C motor small part on throttle body ,controls idle mixture when they fail at idle the engine "hunts" for proper air/fuel mixture . when defective it causes o2 sensors and TPS to compete to set an idle thus the up n down effect.. auto wreckers if your broke new from your local parts store....dealer to much 1 plug in two bolts for most applications

Posted on Feb 06, 2012

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P0340 1995 geo prizm


If it does not have a camshaft position sensor, then it either has a crankshaft postion sensor or a distributer.
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How much is it surging? Surging is usually a sign of a vacuum leak, such as broken hose, etc. Listen for hissing though a length of tubing you hold to your ear, and move around.

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