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Old 08-22-2011, 03:49 AM   #1
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Newbie nedds help!

First i want to say hi to evryone here!

I will try to make this as simple as i can....

I just purchased a 2001 wrangler with a 2.5 litre engine.

It did need a complete tune-up so figured just do that then go from there.

It ran great for bout' a week then one morning would not start.

So i dug in and this is what i have done:

Check for spark: seems fine.

Checked fuel pressure: at rail: 45-50lbs which is seems ballpark according to jeep book i have. I took fuel rail out with injectors and they fire with cranking of motor.

As said, tune-up: plugs- wires- cap- rotor etc.

Replaced: Crank sensor, TPS sensor, MAP sensor.

I have air, fuel and spark but no start!!!

EVEN STARTING FLUID DOES NOT HELP! Yet there is cranking spark!

And the firing order has been checked multiple times to be sure!

I also lined up the timing marks on the damper to TDC compression and pulled the cap and the rotor is @ number 1 cyl, so no chain jumping!

Heres the funny part........you can crank the engine and nothing happens, BUT... when you let go of the key, it belches thru the throttle body and the engine trys to run in reverse.

This is my first jeep and i want to enjoy it but short of a miracle, im stuck!

I do mechanic work and this really has me and my friends stumped!

SO PLEASE, CAN SOMEONE HELP ME!

Thanks and sorry for such along 1st post, but im desperate.....dave.

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Old 08-22-2011, 05:56 AM   #2
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I think this is accurate... #1 cyl. will NOT be at tdc at any time with the marks lined up. #4 will. This would explain the backfire. PM me and I will send you some factory info that was shared with me ( by a guy who knows a few things ). It should help. I had a bad balancer which threw the marks off...watch for that.

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Old 08-22-2011, 06:01 AM   #3
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Let me fix that last post. The timing chain marks don't line up with #1 at tdc. Ooops
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Old 08-22-2011, 07:03 AM   #4
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You don't mention checking for codes?

It's too early for me but did the 2.5 still have a distributor in 2001?
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Old 08-22-2011, 07:48 AM   #5
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[QUOTE=merlinpro;1495909]

the firing order has been checked multiple times to be sure!

I also lined up the timing marks on the damper to TDC compression and pulled the cap and the rotor is @ number 1 cyl, so no chain jumping!

Heres the funny part........you can crank the engine and nothing happens, BUT... when you let go of the key, it belches thru the throttle body and the engine trys to run in reverse. QUOTE]

Sounds like a firing order syptom.
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Old 08-22-2011, 01:14 PM   #6
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thanks for the replys!

heres some answers to your thoughts.....

(1)there is a distrib in this engine...

(2)and it was running after tune-up...

(#)crank was @ "0" timing mark on "comp" stroke and rotor was @ number 1 cyl which is correct accordind to manual...i have not touched dist at all

(4)no codes came up which seems interesting?

(5)and the firing order has not been touch since it was running and then died...

Like i siad, its like nothing happens when you crank the engine over until you release the key, then it belches thru throttle body, yet there IS cranking spark!

Im not an expert, but im wondering if the ecm may be at fault here???

it was running great, then died, and now this...nothing was touched or modified by me and previous owner said it ran great.

please keep the thoughts comming! Dave.
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Old 08-22-2011, 01:17 PM   #7
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stupid thought, but I'd trace the plug wires and make sure they are all going to the correct cyl from the correct location on the distributor. While you were at it reseating them can't hurt anything.
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Old 08-22-2011, 11:31 PM   #8
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You say the plugs are good and there is spark
there is fuel all the way
there is proper timing

The last time I seen a situation where everything is right for starting and yet nothing it turned out to be little to no compression due to a blown head gasket. It just wont start if no compression. Did you check for compression?
Years back we found a large potato hammered into the exhaust pipe of Police car. It was and air-tight exhaust system and the car wouldn't start and when the intake valves opened it ignited a small amount of fuel and puffed back through the carb.
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Old 08-23-2011, 06:25 PM   #9
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A Friend of mine said he had a simliar thing happen to him and he said to try the dist pick-up/hall sensor under the rotor.

He said you may have spark, even if it's a bad sensor, it just makes the ECU not know where to send it at what time....changed his and it was fine there after.



Guess i will try that 2moro.

I will post back and let you guys know what happened...any other ideas are still appreciated !!!!!

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