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post #1 of (permalink) Old 07-05-2007, 03:54 AM Thread Starter
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Jeep stumbling to a start.

As most know I have a 97 tj. Recently when I start it it wants to stumble to a start. It is as if I have to keep cranking even after it starts to take off or it won't start. I have tried FI cleaner, I will pull the throtel body and clean it up, I even cleaned the K&N filter. I thought the filter was the problem cause it was super dirty, but there was no change after a good cleaning..

Any Ideas?? No codes or running rough after it is running just on start up.

Jeff

Ya only go around once, best to enjoy it the first trip.
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post #2 of (permalink) Old 07-05-2007, 07:54 AM
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When the engine is stone cold, spray in a little starting fluid, and see if it starts right up... smoothly. If so, then it's a fuel pump issue. Check the fuel pressure. If it stumbles on the starting fluid, it's that pesky CPS issue. You mention the K&N, have you cleaned/replaced the manifold sensor?
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post #3 of (permalink) Old 07-05-2007, 01:20 PM Thread Starter
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Not that it couldn't be the problem, but it got a new pump, coil, cps, cam position sensor, cap, rotor, and plug wires within the last 1000 mi. I have never replaced the manifold sensor,, Would have to look that one up.

I had a few things last year that pointed to the anti nock sensor,, Can't remember why,,,,, I never replaced it.


Jeff

Ya only go around once, best to enjoy it the first trip.
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post #4 of (permalink) Old 07-05-2007, 02:45 PM
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You're still gonna make it to Haspin Saturday aren't you??? Right now it looks like it's gonna be:
Me
You (hopefully)
JBTater
SweetPea
Tater's brother
Brad
Dan
and maybe another guy I kinda know here from town.

Hope everything works out with the jeep and we see you Saturday!
Aaron.

"4 squirrels runnin' on boggers...and they're angry!!!"
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post #5 of (permalink) Old 07-05-2007, 04:03 PM Thread Starter
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Oh yea I will be there, It is running just kinda starting funny. Only way I won't be there is if something stupid happens friday night at work, then I would just be late...

What time are we going!!!

Ya only go around once, best to enjoy it the first trip.
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post #6 of (permalink) Old 07-05-2007, 07:26 PM
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Just don't fall into the trap if the part's "new" then it's got to be good....
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post #7 of (permalink) Old 07-10-2007, 10:16 PM
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It's a fule thing.

Check:

Choke

Fuel filter

Fuel pressure

Vacum

Any thing that has to do with FUEL.
post #8 of (permalink) Old 07-10-2007, 10:21 PM
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Sounds like the idle air motor. Does it start up and stay at base idle? It should rev up to 1000/1200rpm cold and come back to base idle in 15/30 seconds after startup. If not it is more than likely the idle motor. Might respond to cleaning.
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post #9 of (permalink) Old 07-10-2007, 10:45 PM Thread Starter
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Intrestingly enough, It dosen't idle up just stumbles to a start. Today the battery was low and it didn't want to start until I gave it fuel. I am thinking gunk in the TB or Maybee the idle air control. I will clean verything up then see whare we are.

Ya only go around once, best to enjoy it the first trip.
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post #10 of (permalink) Old 07-11-2007, 01:19 AM
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Since you are saying it starts hard, but not complaining of a misfire or dead cylinder, look for something that affects ALL cylinders.

Find any vacuum leaks - get it running then spray a BURNABLE carb cleaner or starting fluid around anywhere there may be a vacuum leak. If you get an RPM change, you found it.

Having it start better with fuel can mean it's a lean problem. But adding fuel also lowers plug voltage requirements temporarily, making it easier to start with a weak ignition - and fooling you into thinking it's fuel. Don't rule out a weak ignition.

IAC problem would make it difficult to keep running, not difficult to start.

Look at the spark at the plug end of a plug wire - it should be a thin bright blue "snap." Red or yellow indicates low voltage.

Push the coil wire back in the terminals - both ends.
Replace the coil wire with a known good one. (New doesn't always mean good!)
Clean the top of the coil around the coil's tower.

Look closely at the coil wire where it touches ANYTHING - even a vacuum hose. Look at it close for a grayish spot - where the spark is jumping out to something else. Vacuum hoses can be conductive - especially dirty ones.
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