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Author Topic: Need Engine Help  (Read 4905 times)

Offline SteveBailey

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Need Engine Help
« Reply #30 on: January 18, 2007, 07:57:13 PM »
Quote
Originally posted by Cpt. Krunch
Get a compression reading before you go any further.  Sounds like valve trouble.



lol
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Offline rpm

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« Reply #31 on: January 18, 2007, 10:54:59 PM »
Guns, trust in RPM. I would'nt BS you on engine stuff.:)
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Offline CpMorgan

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« Reply #32 on: January 19, 2007, 12:37:08 AM »
Gunslinger,
  What you seem to be experiancing is a "cold starting condition". What I mean here is when the weather gets below a certain degree, your Jeep's computer system enriches the fuel mixture to allow for the lack of vaporization of the fuel before it is ignighted in the compression chamber. Once the engine has reached a certain temperature, the system puts it back to a "normal" setting. If, during this "enriched" period, the setting is a little too rich, due to age of the vehicle or improper adjustment, you will experiance the stumbling and ratteling you seem to be having. It should be checked out with a reputable repair service that have the electronic equipment to monitor and/or adjust the correct settings. If you can afford to wait a few minutes after starting the vehicle untill it warms up, you should be able to drive it normally thereafter. My authority on this is from owning a Jeep Cherokee with a 4.0 six, and also being a certified ASE mechanic for over 10 years. I'd go get it checked out first before I started changing out parts that could get really expensive, and not fix your problem. Just my $0.02 :aok
« Last Edit: January 19, 2007, 12:42:59 AM by CpMorgan »
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Offline lazs2

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« Reply #33 on: January 19, 2007, 10:31:48 AM »
I agree that you do all the easy stuff first..  I would pull the radiator cap and let the car warm up and see what it looked like in there... no bubbles etc.. I would look at the dipstick and see what the oil looked like... dump a can of some water treatment in the tank.  etc.

I would not put up with a car that ran like that when it was cold for 5 minutes or more.

If you don't mind spending the $75 bucks or more it is indeed best to take it to someone with the proper electronic equipment to check it out.

but... My girlfriends s10 would start really hard when it was cold.... obvious fuel problem... I changed the filter (was a *****) and no joy...  hooked up a fuel pressure guage (cheap tool) and it showed fine.

took it to a friends shop who has the electronics and is a certified smog station...  everything was perfect except... the car wouldn't start cold.   He got all the service bulletins on the truck...

ends up... was a fuel pump.   The pump not only has to have between 58-64 pounds but... it needs to not lose more than something like 4 pounds in 15 minutes...

moral is.. all the electronic gear told us nothing and in the end... the cheapo fuel pressure guage did the work (well.... his was an expensive snap on but..)

don't know what this means other than...sometimes it is easy and sometimes not.... sometimes the fancy electronics will tell the tale and sometimes not.

lazs
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Offline Gunslinger

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« Reply #34 on: February 18, 2007, 06:50:27 PM »
To finish this chapter it was either the Plugs, Wires, or distrib/rotor.  THe rotor and points where completly brown, the plugs I pulled where either:  Brown, Green, or completly white  (that might have been from driving it so long.

Either way some new bosch plugs/wires and cap and the thing runs like a champ.  I could have swore the plugs are only a year old but I could easily be wrong and it could be more like 5 years lol.
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Offline Donzo

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« Reply #35 on: February 18, 2007, 08:18:55 PM »
Thanks for the update Gunslinger.

Never would have guessed the ignition system.

Congrats on getting it fixed. :aok
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Offline rpm

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« Reply #36 on: February 19, 2007, 03:37:27 AM »
Ditto. It sure didn't sound like ignition, but ya never know. At least ya didn't tear it down to replace a head gasket.:aok
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Offline Angus

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« Reply #37 on: February 19, 2007, 04:04:03 AM »
LOL, that would have been my guess.
But bad ignition can also put up quite a show.
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Offline lazs2

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« Reply #38 on: February 19, 2007, 10:17:26 AM »
So if you would have pulled the plugs to do a compression check you would have noticed that they weren't firing right?

lazs
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Offline Airscrew

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« Reply #39 on: February 19, 2007, 11:30:39 AM »
Quote
Originally posted by lazs2
So if you would have pulled the plugs to do a compression check you would have noticed that they weren't firing right?

lazs

:aok   :D
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Offline Kuhn

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« Reply #40 on: February 19, 2007, 01:02:34 PM »
Quote
Originally posted by Gunslinger
To finish this chapter it was either the Plugs, Wires, or distrib/rotor.  THe rotor and points where completly brown, the plugs I pulled where either:  Brown, Green, or completly white  (that might have been from driving it so long.

Either way some new bosch plugs/wires and cap and the thing runs like a champ.  I could have swore the plugs are only a year old but I could easily be wrong and it could be more like 5 years lol.


Sounds like it was the wires to me. They would quit arcing after the engine warmed up and dried them. Seen it happen before. Wonder if it ever ran bad during rain or foggy days.
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Offline Gunslinger

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« Reply #41 on: March 02, 2007, 05:09:58 PM »
Well it seems I'm curing the symptoms and not the disease.  It's happening again.  It's not as bad as before but I think I ruined the CAT in the process cause it sounds like a bunch of marbles in a tin can.  

Now I know I have an exhaust leak that I'm fixing this weekend but it seems to have fouled up another plug.

The first cylinder isn't firing.  It comes and goes but it's here to stay now.  I'm gonna pull the plugs again tomorrow and look at them.  I think the Jeep has bested me this time and its gonna take a professional to diagnose the problem.  

anyone have any other idears?

Everything else is good.  no major leaks except the rear main.  They seem to allways go in jeeps.
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Offline nirvana

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« Reply #42 on: March 02, 2007, 06:45:59 PM »
Catalytic converters are just one of those things, one of those expensive, pain in the bellybutton things that will die, as everything else on the vehicle will.  Mostly likely due to getting it hot and then hitting a puddle or something like that, causing the material to break apart (if it's honeycomb style).  Broken pieces clogging your exhaust can cause a no start, happened to a kids car at school and baffled the teacher for an hour and a half.  You might just have a piece getting somewhere just enough to clog it up a bit.

That might be what's fouling up your plugs but I'm not really sure, if your piston rings are sealing then it's probably running too lean, which you should be able to smell.

Good luck on the diagnosis, hope it doesn't cost you too much.

 Forgot about worn valve guides letting oil in.  Here's a site on spark plugs if you want to look into them more in depth http://www.aa1car.com/library/sprkplg2.htm
« Last Edit: March 02, 2007, 06:52:16 PM by nirvana »
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Offline WhiteHawk

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« Reply #43 on: March 03, 2007, 06:32:41 AM »
did you overfill it?
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Offline bj229r

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« Reply #44 on: March 03, 2007, 06:58:42 AM »
Didja check the dinglebolt?
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