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Start of engine issues or just time for a REAL tune up.

Hi everyone.

My jeep is doing something new and I just can't seem to shoot this one.

Some back story.. Neglected my tune ups.. blah.. blah.. didn't rebuild my carb like I should have.. blah blah.. all of a sudden after running a tank of ultra 94 it started to run like a sack of wet crap. Figure I'll finally do some maintenance.. So I rebuild my carb, since it was gunked beyond belief, change air filter, pcv, fuel filter (easy stuff cause I'm lazy see) etc.

Crank it up and while it still isn't running so hot, (but I have not dialed my carb back down as everything changes once you clean em) it sounds pretty strong.. won't idle worth a crap, but again some of that for sure is carb related. Now as soon as it starts to warm up.. rpms drop and the thing wants to barely run. Now I'm on the gas when this happens as I had been keeping the RPM's at about 1700 or so.. it drops to about 1000 RPMs.. feels horrible then like the timing was off.. misses gives off a pfffft! catchs again.. and then by that time I'm shutting it down.

Time to do timing as well as mix again? Exactly how does one throw off the timing.. I've had it set for about 2 years now without a problem and in the last 6 months I haven't offroaded the beast (cuz I'm po now).

Or.. it this the beginning of the end of my rebuilt - rebuild engine? I have a spare that I was supposed to be ripping down and building this summer.... Guess I should get off my butt and get started.

Oh yeah.. 89 YJ with a 4.2 and stock carter carb, nutter by pass so no computer either.

Norm Mitchell

89 YJ Renegade
Reply to
Norm Mitchell
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What does your distributor cap look like? I suspect an ignition problem. Plug wire, spark plug, something like that could be bad. It is unusual for an engine to go bad "just like that" and I don't really think that tank of ultra 94 had much to do with it. Did you check the fuel filter?

Earle

Reply to
Earle Horton

I'm pretty sure I rebuilt the carb rigbt.. Hehe.. Mike is the one who taught me as we used to be nieghbors. (and I've rebuilt his carb once "as an exercise" right after he taught me to rebuild mine! Now I will say that I need his carb tuning skills.. I checked the tubes (and they have been reamed a bunch of times) and they are ok as well, but no harm in checking again..

Come to think of it 1'st time I rebuilt the carb gunk plugged up the tube that had come free after the cleaning. I'll check egain.

Norm Mitchell

89 YJ Renegade

Reply to
Norm Mitchell

Remember that EGR valve that had to be worked on in order to pass the last emissions test Norm?

Do you also remember what happened to the spark plugs after the last bout of a messed up carb?

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Norm Mitchell wrote:

Reply to
Mike Romain

Did it smell like fish oil? Blown condenser (capacitor)?

Reply to
TJim

I changed those plugs.. Now I'm gonna check them all tomorrow when I get home (tonight is just too busy). And I'll clean them while I'm at it.

EGR is moving at least. I checked that.. didn't pull it off though.. Guess I'll give at a look at as well.

Norm

Reply to
Norm Mitchell

Reply to
RichH

Bet the tubes plugged back up like last time...

I don't know why, but I have only got away with it with one plug up once after cleaning the line last time. Did you clean the chunk of gas line from the carb to the filter?

Man, we just have shitty gas around here that leaves so much crud behind when it evaporates....

The line from the filter to the carb almost empties out a lot of times on a shutdown and collects sludge/rust.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

Norm Mitchell wrote:

Reply to
Mike Romain

I "soaked" that metal gas line while I was cleaning the carb.. I suspect that I need to re-ream the tubes (as I didn't have anything small enough I coundn't do it.. though I could blow through them pretty ok). Could be that like last time a piece of gunk that floating around has found its way to the idle tubes.. I suspect that it is more than that, but I guess we'll see.

Norm Mitchell

89 YJ Renegade

Reply to
Norm Mitchell

Yeah - that, mixed in a few other nondescribable odors. I can't see where it may have been anything that broke - it was OK the next day.

Reply to
Carlo Jr.

That will do it every time....

Mike

Norm Mitchell wrote:

Reply to
Mike Romain

Sounds like the time I kept having all sorts of error codes set. Trouble shot nearly every sensor. Then when in total disgust I yanked the power connection for the diagnostics tool, off came the bloody ground clamp on the battery. :>

I'll be.. Code 12 does mean something after all.

Reply to
DougW

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