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Engine only runs in reverse

Tiny
ACTIONAUTOREPAIR
  • MEMBER
  • 1988 CADILLAC SEVILLE
  • 4.5L
  • V8
  • 2WD
  • AUTOMATIC
  • 121,000 MILES
Engine will not run in idle/drive/park but runs fine in reverse.
Monday, September 14th, 2020 AT 3:29 PM

18 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

Do you mean it will idle in reverse and move fine but shuts off as soon as you put it in drive?

https://www.2carpros.com/articles/stall-at-idle

Does it idle in park?

They had an idle speed control motor on the throttle body but if it was bad, it would do it all the time.

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

Can you check for codes by pushing the off and warmer buttons at the same time and give me all the E codes?

Roy

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Monday, September 14th, 2020 AT 3:48 PM
Tiny
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Okay, will try that. Never heard of that before.
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Monday, September 14th, 2020 AT 5:25 PM
Tiny
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Keep me updated.

Roy
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Monday, September 14th, 2020 AT 6:08 PM
Tiny
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Got code E52 out of that car.
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Tuesday, September 15th, 2020 AT 10:43 AM
Tiny
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It runs badly in Idle/drive/park but as soon as you put it into reverse it runs fine. We did find some vacuum hoses that were broken fixed them.
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Tuesday, September 15th, 2020 AT 10:46 AM
Tiny
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Is E52 related to oil temperature sensor?
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Tuesday, September 15th, 2020 AT 1:41 PM
Tiny
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The 52 is for the anti lock brake system. I attached the chart for you.

It has nothing to do with your issue.

Watch the idle control motor. When you put it in forward, does the arm come out and increase the idle?

Roy
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Tuesday, September 15th, 2020 AT 2:16 PM
Tiny
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Okay, will have a helper start the car and I will watch.
It's just so weird that it lopes and runs inconsistent in Drive/Park/Idle then in Reverse it runs perfect.
This one has me totally stumped.
I looked up on GM website the ECodes. What I found was low engine temperature was E52, would that affect the engine?
Could a temp sensor be out?
I will check the throttle body and the idle control asap and get back to you.
Thanks for your help. This is making me go crazy!
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Tuesday, September 15th, 2020 AT 3:47 PM
Tiny
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P.S. Did not see your chart that you attached.
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Tuesday, September 15th, 2020 AT 3:48 PM
Tiny
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Alright we started it and the arm came out.
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Tuesday, September 15th, 2020 AT 3:55 PM
Tiny
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It's weird because like today it ran fine in drive but when we started driving it it lopes and runs inconsistent.
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Tuesday, September 15th, 2020 AT 3:57 PM
Tiny
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Did the arm come out in drive?

No to the coolant sensor. It would effect both forward and reverse.

Sorry, I reattached the chart.

Roy
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Tuesday, September 15th, 2020 AT 4:10 PM
Tiny
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Yes the arm came out!
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Wednesday, September 16th, 2020 AT 10:52 AM
Tiny
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Okay, that concerns me. This means it is working correctly and it should run and not stall.

The one thing that could cause it to stall is the torque converter. It could be locked internally and not releasing.

Roy
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Wednesday, September 16th, 2020 AT 10:58 AM
Tiny
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Thanks. Will check that next.
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Wednesday, September 16th, 2020 AT 8:15 PM
Tiny
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You know that's funny, I mentioned that to my guys and got nothing but "no's couldn't be!"
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Wednesday, September 16th, 2020 AT 8:20 PM
Tiny
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I remembered from years ago having a car do that, but none believed me this last two weeks..
Thanks again for your quick responses will keep you posted.
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Wednesday, September 16th, 2020 AT 8:21 PM
Tiny
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You are welcome.

Always glad to help.

Roy
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Thursday, September 17th, 2020 AT 4:08 AM

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