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Old 02-09-2005, 03:35 PM
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Pop pop pop

That's the noise my 258 Jeep makes when I start it.

Finally got rid of the electrical gremlins (a bad splice and a couple wiring errors) and it now cranks and starts. I know the timing is a little off (the hold down bracket on the distributor doesn't hold down) but I twisted to where it would start and keep running, now I'll break the timing light out.

But...

It was going pop pop pop pop pop pop like one cylinder was backfiring through the carb. So I started to pull one plug at a time. It is #6. With six disconnected it idles so smoothly it's hard to tell it's running on five.

If five are good it can't be the timing. Valvetrain? what is the easiest next check? I had the head off to replace a gasket... could it be an overtightened rocker?

Thanks in advance for the always good feedback.

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Old 02-09-2005, 03:46 PM
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pop

It could be timing off
over tightened rocker
plug wires in wrong order
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Old 02-09-2005, 03:50 PM
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Yep sounds like a bad adjusted valve. Had the same problem but was running a big cam wit push in studs guess what? Put in screw ins.
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Old 02-09-2005, 05:17 PM
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After doing the suggestions above( and it still is poping ) I would run a compression test to see if there is a dead cylinder. Easy stuff first is the way I do things, ( well try to anyway).

John
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Old 02-09-2005, 06:51 PM
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350

i had the same problem with a 350 chevy and it turned out to be a rocker that was too lose. it ran great after i re-adjusted the valves.
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Old 02-13-2005, 06:50 AM
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well...

pulled the valve cover, loosened #6 intake and took it back to just barely snug. The popping reduced and became less regular but did not go away..... adjusted the timing a little (by ear) and it reduced a little but did not go away.... lost my help (both of my sons had dates) before I could get out the timing light.

Valve spring looks ok visually from what little I can see in the vehicle...

checked plug order --its ok... any other ideas? Should I pull the head yet?
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Old 02-13-2005, 07:28 AM
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adj both valves ....

see if that helps...who messed with the valves to begine with? Was this engine running before you started working on it?


Tazz


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Old 02-13-2005, 07:39 AM
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With the valve cover & coil wire off crank the engine over and compare your rocker movement with the others.

if they appear to move the same amount as the others run a compression test as propaniac suggested.. Also Bracketeer said to check the firing order.
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Old 02-13-2005, 01:14 PM
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New observation

Pulled the valve cover again today. Answering earlier questions:

firing order ok

engine was running, but not well, due to carb problem (rebuilt it)

pulled head due to weak compression on 5 & 6, think there was a small head gasket leak

Today:
pulled coil wire and cranked it after loosening and resnugging (just barely) #6 intake.

#6 exhaust rocker is loose and not moving, even when tightened.

Preparing to pull head. What should i look for next?
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Old 02-13-2005, 03:13 PM
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look for a collapsed lifter or a bent rod or something that looks excessively worn.
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Old 02-13-2005, 03:31 PM
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Looked at the rocker arms and tops of pushrods. Nothing obvious. Collapsed lifter next suspect, and its too late in the day for me to start pulling the heads.

Also, I need a lifter removal tool. Jeep FSM lists the tool as J21884. Do I need to go to the dealer, or can someone tell me a good substitute?
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Old 02-13-2005, 03:41 PM
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You probably have a lobe down. Do you have to pull the head to check the cam? And i don't know any easy tools to use to pull the lifter.
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Old 02-13-2005, 03:52 PM
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you dont need to pull the head to check the lifters... you need to pull the intake manifold then all the lifters are right there in the valley. even still thats a job in itself.
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Old 02-13-2005, 04:34 PM
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Uhh, Correction Matt. This is a 258 Jeep motor, thats an Inline 6 cylinder. Theres no lifter valley, your thinking of a V8

Sounds defenitely like a flat cam or bad lifter. Looking through all of my tool books I don't see a Aftermarket tool for removing the lifters, sorry.

I have a set of these Lifters in my parts department and I took a look at them and I don't see any need for a tool to remove them. Carefull use of some pliers and a rag should work
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Old 02-13-2005, 04:56 PM
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your right

my bad... i guess i would have caught that if i read a little more carefully
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