LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Car dies, then throws on SES light

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Old Apr 9, 2006 | 01:55 AM
  #1  
Sceanzo's Avatar
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From: Wilmington, NC
Car dies, then throws on SES light

Well I came home tonight and as I was backing in the driveway my car started to stumble then it died. So I put it in neutral and tried to start it again. Well the car started right back up but had the SES light on. It then idled a little weird after that. I didn't have time to look at it since it is 3am and I am very tired. So if anyone has any ideas on what it could be please post them.
Old Apr 9, 2006 | 02:22 AM
  #2  
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From: Westhampton Beach, NY
Re: Car dies, then throws on SES light

Probably a stupid question but how much gas is in the car. One time mine did the same thing and I thought my new fuel pump went. The gauge read nearly 1/4 tank left and it did the same exact thing yours is doing also with the ses light and stalling. It turned out it ran out of gas when the gauge read 1/4 tank left.
Old Apr 9, 2006 | 11:35 AM
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Re: Car dies, then throws on SES light

No substitute for a code scan.... should give you the specific problem.
Old Apr 9, 2006 | 11:43 AM
  #4  
Sceanzo's Avatar
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Re: Car dies, then throws on SES light

I have about a Half tank of gas in my car. Also it did rain lastnight so do you think that could have had an effect on it? But after work today I will go get it scanned for codes
Old Apr 9, 2006 | 12:13 PM
  #5  
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Re: Car dies, then throws on SES light

Sounds very similar to a MAP problem. I'm not sure about OBDII cars but, OBDI's can be disconnected sending the car into limp mode. Have it scanned to make sure.
Old Apr 9, 2006 | 12:16 PM
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Re: Car dies, then throws on SES light

what is limp mode? Does this cause power loss.

Cause my car has a really big cam in it and i think its making the MAP sesnor come on at idle. HAd it tested and it was fine.
Old Apr 9, 2006 | 12:55 PM
  #7  
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Re: Car dies, then throws on SES light

The engine will run with most of the sensors disconnected (he has a 95, its OBD-I, not that it makes any difference). The PCM just defaults to internal calculations and tables. But the performance is going to suffer, since the PCM is in many ways just "guessing". Some people call that "limp mode", but true limp mode gets used only when virutally every input is lost.

A big cam won't cause your "MAP sesnor (to) come on at idle." The MAP sensor is used all the time to use as a lookup to set ignition timing, determine the correct long term fuel correction cell, etc. A "big cam" may pull so little vacuum that it causes the PCM to set the "high MAP sensor voltage, low vacuum code". That one sets if the MAP is over 68kPa at idle.

Again, its a huge waste of time to speculate what the problem is, when a simple scan might tell you what it is. Could be the MAF, TPS, MAP, problems with the IAT actuator, EGR stuck open (if you have it), etc. etc. etc.
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