Question about 1989 Jeep Grand Wagoneer

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My '89 Jeep Wagoneer won't start. It has a 6month

My '89 Jeep Wagoneer won't start. It has a 6month old battery that was recently checked and machine said it was good. Starter relay is new. Battery leads are new. Battery reads 12V. Starts with no problems with a boost. Once started, I can remove battery leads and it still runs. I can turn it off and restart it but if I leave it for more than a couple of hours it won't start. Electrical? Something draining battery? If I get a boost, drive it for a bit then park it, take the leads off then let it sit overnight, the battery still reads 12V but won't start??? What the???

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Sounds like the starter actually have some one load test it for you, might be drawing more power then it need, hence the need for a jump

Posted on May 10, 2009


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I have a 1988 Jeep Grand Wagoneer that seems to be losing oil pressure then dying. I just changed the oil and the levels are fine. Not sure where to start... any ideas?

if this just started when you changed the oil and filter,then it might be the filter,it did it in my 89 jeep so i changed the filter to another brand and my oil pressure came back to i would recomend and stp or k&n or wix filter.if that doesnt then start looking at the oil pressure sensor and wire could also use a mechanical oil pressure guage and check it that way to.

Jun 01, 2011 | 1988 Jeep Grand Wagoneer

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89 wagoneer - Automatic transmission will not shift into higher gear. Can only drive at 15 mph.

a question , is the jeep in 4 wheel drive? and does the dash say its in gear ? what size is the motor

Jan 30, 2011 | 1989 Jeep Grand Wagoneer

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My 89 jeep grand wagoneer started overheating on the highway but the temp stays at 220 if i keep it under 55mph. replaced the fan clutch 7 months ago.

That can be your thermostat that do not open(stuck) when the motor is warm, take that out and drive for a few miles but keep an eye on the heat indicator if the problem still exists then your radiator need a flush. remember a thermostat is for cold conditions, if you saying in a warm area or country that thermostat is not necessary

Dec 12, 2010 | 1989 Jeep Grand Wagoneer

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When we turn the light on on the 89 grand wagoneer the light are dim and the guages all drop alternator is good also fan motor comes on

Check the ground wires on both sides By the headlights. Make sure they are connect to the body.
Lights use a lot of power, when they loose there primary ground, they will feed back threw whatever they can. Also check the battery for a body ground. Let me know

Dec 05, 2010 | 1989 Jeep Grand Wagoneer

1 Answer

I have an 89 Jeep Wagoneer inline 6. Its not

You got the ignition cover, what you need to do an cylinder compression test and also check your injector for voltage while engine running hook test light to battery pos on neg and neg on pos, at injector harness check for pulsation, if you have pulsation elec. system ok, if good compression bad injector.if bad compression piston ring's or valve's.

Dec 08, 2009 | 1989 Jeep Grand Wagoneer

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Jeep won't start with good battery

sounds like a fuse or starter relay.if your battery is fully charged.check for power at the starter when you turn the switch. you should have a starter control relay in your fuse box/relay center.

Apr 29, 2009 | 1989 Jeep Grand Wagoneer

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