My GC Is Satan! Cranks foever then starts...with a twist - Jeep Garage - Jeep Forum

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Old 03-29-2015, 03:59 AM
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Angry My GC Is Satan! Cranks foever then starts...with a twist

Hi all,
Ive had my 03 GC for three years (Ltd 4.7L V8) and it is satan. I have a very LONG list of problems some fixed some not. The one causing me the most grief atm is this cranking forever before starting. This happens 98% of the time. There are some very rare and totally random occasions when it will miraculously just start first turn (hot, cold makes no difference)

BUT and heres the twist.. every time I put fuel in it at the gas station, it starts first turn. EVERY time.

I have replaced (in no particular order and off the top of my head):
fuel pump, o ring, fuel filter/reg, all new air lines, map sensor, cleaned and tested tps and throttle body, new spark plugs, exhaust manifold, had compression tests on each cylinder-fine, new battery, coils, and oxy sensors.

Now, I did have a mean stuttering problem (so bad you didnt dare stomp on it if you wanted to overtake-you just never overtake) but since doing the fuel pump, o ring and filter/reg, it snots.....but one day later i now have this slow rough "about to stall" idle (when it finally starts) with the red check guages dash light.. if i give it a rev it smooths out but is still rough and when braking into say a stop sign it chugs like its going to stall.

Fix one problem ..create another...?? I have now replaced plugs hoping that was it but arghghhhh....no, still cranks and cranks before it starts.

Thanks in advance

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Old 03-29-2015, 05:59 AM
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Re: My GC Is Satan! Cranks foever then starts...with a twist

Which engine do you have?
Did you try to prime the fuel system before starting? Just switch ignition in run for three seconds, off, in run for three seconds, off and now to start. Any change?
Since refueling has something to do with it, does it make any difference when you remove the fuel cap and install it again (remove the vacuum) and then start?
I presume you have checked for fault codes?
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Old 03-29-2015, 05:46 PM
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Re: My GC Is Satan! Cranks foever then starts...with a twist

Will give those things a try, and post soon, have edited above, ita a Ltd 4.7L V8. Havent had the engine check light since having the fuel pump etc done and they were p0171 p0174 and p0123 if i recall rightly which are lean on both banks and tps voltage too high (tps is tested and fine) will do the key on-off to see if any codes come up aswell.
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Old 03-29-2015, 07:29 PM
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Re: My GC Is Satan! Cranks foever then starts...with a twist

Is that the original TPS? I had all kinds of crazy stuff when my TPS was bad at 80k miles. Replaced with Mopar piece and been great since then.
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Old 03-31-2015, 05:58 PM
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Re: My GC Is Satan! Cranks foever then starts...with a twist

Had the same problem with mine. Long cranking before starting then it would splutter into life. At idle would fluctuate between 500-700rpm and try to stall after a few minutes. Did most of the things you did which didn't help. Turned out I had 2 stuffed injectors. Replaced problem solved. Starts first time every time now


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Old 04-25-2015, 01:02 PM
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Re: My GC Is Satan! Cranks foever then starts...with a twist

Sorry, but I'm glad to see somebody else is having this issue with their jeep. Mine is a 2001 JGC Limited with 4.7 V8. So random when its going to start or not start. But now that the weather is gettting warmer, it's having less of this issue. in fact, hardly at all. I had it to the mechanic for some testing, but OF COURSE, it never acted up in the couple of days he had it and he said he can't run a scanner on it to learn anything unless it's acutally in the "no start" state. He said he really doesn't have a clue and didn't feel the crank sensor would act so randomly and not worth $ to replace without knowing for sure. There have been times it took me 20 minutes before it would finally fire up and run. Sometimes when it starts it putters for a while, sometimes it fires up like there's not issue at all. very odd. idk what is wrong with it. I have a code for a downstream o2 sensor, I believe, but i've had these before and it never affected the jeep from starting.
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Old 05-15-2015, 02:23 PM
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Re: My GC Is Satan! Cranks foever then starts...with a twist

Sounds like crank or cam sensor or possibly the ica sensor. Mine did the same i did the crank and cam sensors and she fires every time now
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