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88 laredo cutting out/not starting after being warmed up

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Old 03-21-2014 | 09:19 PM
  #16  
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Solder those connections before doing anything else. Make sure the harness is routed properly.
Attached Thumbnails 88 laredo cutting out/not starting after being warmed up-cps-wire-routing.jpg  
Old 03-25-2014 | 07:00 PM
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Ok, so update. I have finished the list from cruiser's comment, and soldered the connections. Still, the same thing is happening. it feels like its choking out, like it's not getting enough oxygen or maybe the idle is too low. When I'm driving its fine, but when I take my foot off the gas and start to apply the brake, soon and the brake is pressed, the rpms just drop.

My friend suggets looking into getting a new solenoid sine it looks to be the original, or very old one, still in there.
Old 03-26-2014 | 08:07 AM
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Have you ever cleaned your throttle and IAC? I think the IAC is maybe what your friend is referring to.

Check to be sure your intake manifold bolts aren't loosening up.

How is the integrity of all your vacuum lines on the engine?
Old 03-26-2014 | 10:39 AM
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I tried to replace my IAC before, but when I placed in the new one, the rpms just shot up to 5500 and wouldnt come down. So I just re installed the old one since it looked to be fine. Ill take it off again when I get home and post a pic, maybe im missing something.

The vacuum lines are pretty decent. When I pulled them off it ran a littler richer, but when I plugged them with my finger the motor really choked out.
Old 03-27-2014 | 11:55 AM
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Originally Posted by bdcontraplayr
I tried to replace my IAC before, but when I placed in the new one, the rpms just shot up to 5500 and wouldnt come down. So I just re installed the old one since it looked to be fine. Ill take it off again when I get home and post a pic, maybe im missing something.

The vacuum lines are pretty decent. When I pulled them off it ran a littler richer, but when I plugged them with my finger the motor really choked out.
High rpms on start up makes me think tps
Old 03-27-2014 | 12:02 PM
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Have you tried having a friend start it for you while you stand by the tb? I found out I had bad vacuum leaks by simply removing the airbox from the tb, and using my thumb to close off the iac port, but it still idled at spec. Case and point, I'd try this to eliminate the iac as a possible cause or to narrow it to the culprit.
Old 03-27-2014 | 12:37 PM
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Originally Posted by 884x4

High rpms on start up makes me think tps
I replaced that along with the IAC, but the IAC was the was thing that shot the rpms up. I replaced them separately, like an hour a part
Old 03-27-2014 | 12:43 PM
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Originally Posted by Parsnip
Have you tried having a friend start it for you while you stand by the tb? I found out I had bad vacuum leaks by simply removing the airbox from the tb, and using my thumb to close off the iac port, but it still idled at spec. Case and point, I'd try this to eliminate the iac as a possible cause or to narrow it to the culprit.
So what I did was removed the IAC last night, cleaned it up. Put it back and started it without it being plugged in seemed to run the same, but I'll report back tonight with your trouble shooting idea
Old 03-27-2014 | 05:58 PM
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Originally Posted by bdcontraplayr
I replaced that along with the IAC, but the IAC was the was thing that shot the rpms up. I replaced them separately, like an hour a part
Did you ADJUST the TPS?
Old 03-27-2014 | 09:42 PM
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Originally Posted by cruiser54

Did you ADJUST the TPS?
Good point! It needs to be adjusted forsure
Old 03-27-2014 | 10:52 PM
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I pulled the IAC off and the RPMs took off again. I'm thinking it might be the electrical connection, because my temp isn't reading any more. But I'm going to clean my throttle body tomorrow, see what happens
Old 03-28-2014 | 12:03 AM
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Originally Posted by bdcontraplayr
I pulled the IAC off and the RPMs took off again. I'm thinking it might be the electrical connection, because my temp isn't reading any more. But I'm going to clean my throttle body tomorrow, see what happens
Did you adjust the tps per cruisers instructions like asked before?
Old 03-28-2014 | 12:35 AM
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Had and 88 with the same problem before it was the cam sensor for me. So it either that or the crank sensor.
Old 03-28-2014 | 12:37 AM
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Originally Posted by justjerald
Had and 88 with the same problem before it was the cam sensor for me. So it either that or the crank sensor.
They don't have a cam sensor.
Old 03-28-2014 | 12:46 AM
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Originally Posted by cruiser54
They don't have a cam sensor.
My bad the sensor inside the distributor. Autozone has labeled as a pick up coil.


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