Question about 1986 Jeep Comanche

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My jeep Comanche will not start unless I put gas into the carburetor then it will run fine.

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  • Alan Jay Hanley
    Alan Jay Hanley Oct 13, 2013

    After the jeep starts it keeps on running until you shut it off I could drive a 100 miles.

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  • Jeep Master
  • 44,379 Answers

Check fuel pump for operation. Check for blocked fuel filter. Check for problem of tank not venting and creating a vacuum that will not let the fuel to be pumped to the carby.. Check that the needle and seat in the carby is not jammed closed or the small filter at the inlet is not blocked

Posted on Oct 13, 2013

  • Bill Boyd Oct 13, 2013

    check positioning of the fuel lines as you appear to be getting a vapour lock in the syatem. Sometimes fitting a small fuel filter next to the carby inlet will overcome this problem

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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MrScary66613
  • 1990 Answers

SOURCE: 1987 jeep comanche head unit wiring harness

Do you mean Aftermarket or Factory Harness????

Posted on Jan 31, 2009

Molson02536
  • 3854 Answers

SOURCE: jeep will not start unless you give it gas

It sounds like the idle air control valve (IAC) may be stuck with carbon build up. You can ether remove the IAC, or if your lazy like i am, buy two cans of Throttle body cleaner. Just follow the instruction on the can and pay attention to the IAC, try to spray the Throttle body cleaner hose towards the IAC. DO NOT USE CARB CLEANER, it's too corrosive to the gaskets used on throttle body's. If your going to remove the IACThe idle air control valve is located on the back of the throttle body. It has an oval electrical connector and two torx screws holding it in. Unplug the connector, remove the two screws then lightly tap the body with a soft faced mallet to loosen it from the body. Once you have it out and prior to installing a new valve clean the seat inside the throttle body where the idle control fits. This must be very clean! Installation is in the reverse order. Btw, to save some cash, pull the valve out and clean it, this usually fixes the problem for quite a while. Look for crushed / cut, just any signs of damage to the wire harness to your IAC. After you have cleaned the IAC and still have the problem, you may have a bad IAC and needs to be replaced. Good luck and hope this helps. 

Posted on Jun 21, 2009

  • 160 Answers

SOURCE: Jeep starts sluggish and then wants to die

It is most likely from that actually. You may need to adjust the air / fuel mixture after modding the intake. Sounds like its getting too much air.

Posted on Jul 17, 2009

  • 54 Answers

SOURCE: 1987 jeep comanche 2.5L (gas). Engine died

Do you have a rpm guage? If so see is it moves when cranking, if not the crankshaft sensor is bad and is located on top of the transmission bell housing. Also it can be scanned to confirm a faulty sensor

Posted on Jul 29, 2009

  • 4088 Answers

SOURCE: 1987 jeep wrangle will not start or run

Uncouple the fuel line coming from the pump at the carburetor, place a clean can under the line, and have someone operate the starter--you should have fuel shoot from the line in spurts as the engine turns. If it does, then the entry port on the carburetor is plugged. Remove the float assembly and pull out the float needle valve. Hook the fuel line back to the carburetor and try the starter again, there should be fuel pumping into the float bowl. If not, check to see if there is a filter on the fuel inlet path that may be plugged. If no filter, remove the float needle seat to see if something is blocking the fuel passage. If all else fails, use compressed air to blow backwards through the needle seat (remove the fuel line again). Hope some of this helps!

Posted on Feb 20, 2010

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1 Answer

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Hello
It sounds like a glogged fuel filter or throttle body problem. Disconnect gas line at carb get a small jar or can to catch gas, hold gas line in jar and have someone crank engine, If you have good gas flow to carb then Its a throtle body problem, (Throtle body and carb are same thing just in case you did not know)could be electrical or mechanical problem at throttle body, Its usually electrical, fuel flow meter. Hope this helps

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Help


ive run into this once before and it turned out to be the intake valve spring was broken not giving the correct seat pressure. not sure its your problem but it looks like you have covered all the other bases.

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