What did you do to your YJ today? - Page 3883 - JeepForum.com

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post #58231 of 71286 Old 07-18-2014, 07:45 PM
cyoos
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Quote:
Originally Posted by grandboost98 View Post
The plugs all looked healthy. What might cause the motor to get higher compression?

I want to put a timing light on it and see what that shows me but the timing isn't manually adjustable. What does control the timing and or advance on a tbi 2.5 ?

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The timing is controlled by the engine computer using signals from the crank position sensor, tach, and other shtuff...O2 sensor(?). I think they call it a PCU or ECU.

Maybe the station had a bad batch of gas? It does happen.

In the old days it might have been carbon build up in the combustion chamber causing higher compression, but it wouldn't happen all at once. Plus, todays detergents or additives they put in fuel help keep the combustion chambers clean(er)

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post #58232 of 71286 Old 07-18-2014, 07:49 PM
95YJMountie
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Today, i looked at it, wanting to drive it, but being in the process of moving, the jeep got put on the back burner.

On the plus side, i received a couple decals in the mail from renewing my membership. Anybody seen these ones yet?? I haven't.
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post #58233 of 71286 Old 07-18-2014, 08:24 PM
Shadownwpa
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Yesterday por15'd the fenders, rockers, tailgate and front bumper... today they got some rustoleum semigloss black. I picked up a shutz gun to spray monstaliner on em once everything cures enough.


http://www.jeepforum.com/forum/f22/shadownwpa-91ish-yj-build-thread-1857154/
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post #58234 of 71286 Old 07-18-2014, 08:31 PM
95YJMountie
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Quote:
Originally Posted by Shadownwpa View Post
Yesterday por15'd the fenders, rockers, tailgate and front bumper... today they got some rustoleum semigloss black. I picked up a shutz gun to spray monstaliner on em once everything cures enough.

Why did you por 15 and paint with rustoleum, if your just gonna monstaline over top of it??
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post #58235 of 71286 Old 07-18-2014, 09:13 PM
youngjeepr
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I didn't like where I put the new motor so I pulled it back out and moved my mounts an inch forward.






88 YJ- 4.7l stroker, AW4, SOA, 8.8, hp D30 powertrax no slip,3" front stretch with waggy springs, stock replacement springs in the rear, 35/12.5 r15 goodyear kevlars

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post #58236 of 71286 Old 07-18-2014, 09:32 PM
Shadownwpa
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Quote:
Originally Posted by 95YJMountie View Post
Why did you por 15 and paint with rustoleum, if your just gonna monstaline over top of it??
Por15 is on the bare metal as a final barrier against corrosion. Rustoleum is painted on the entirety of it.. because por15 isn't UV stable. The monstaliner is only going on the outside and tops of the fenders/armor.

http://www.jeepforum.com/forum/f22/shadownwpa-91ish-yj-build-thread-1857154/
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post #58237 of 71286 Old 07-19-2014, 12:16 AM
squishy
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Quote:
Originally Posted by grandboost98
The plugs all looked healthy. What might cause the motor to get higher compression? I want to put a timing light on it and see what that shows me but the timing isn't manually adjustable. What does control the timing and or advance on a tbi 2.5 ? Sent from AutoGuide.com Free App
Check your fuel filter!!!

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post #58238 of 71286 Old 07-19-2014, 02:23 AM
gtg413i
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Quote:
Originally Posted by cyoos
Rather than glue, I wonder how a piece of bicycle tire innertube would work as kind of a bushing to keep it from wobbling?
Just buy the bushing from Morris 4x4. Like $8. Had to do mine this year.
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post #58239 of 71286 Old 07-19-2014, 05:30 AM
grandboost98
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Quote:
Originally Posted by cyoos View Post
The timing is controlled by the engine computer using signals from the crank position sensor, tach, and other shtuff...O2 sensor(?). I think they call it a PCU or ECU.

Maybe the station had a bad batch of gas? It does happen.

In the old days it might have been carbon build up in the combustion chamber causing higher compression, but it wouldn't happen all at once. Plus, todays detergents or additives they put in fuel help keep the combustion chambers clean(er)
Well the cps must be good or it wouldn't run, right? The tach seems to be fine. I took readings from the O2 a couple weeks ago that looked good. Hopefully it's not the computer.

I thought I had picked up a tank of bad gas a week or 2 ago but I filled up at a few different stations since then and it seemed to be getting better. Then when I filled up with premium, the issue went away. Filled up with regular again and immediately spits and spudders almost worse than before




Quote:
Originally Posted by squishy View Post
Check your fuel filter!!!
That was my first guess that maybe a couple weeks ago I did pick up bad gas and it gummed the filter up but it ran so good on premium I was starting to look for another answer.

I'll be heading to the garage soon to change the filter and see if I can figure anything else out


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post #58240 of 71286 Old 07-19-2014, 08:23 AM
grandboost98
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Could barely start it when I went to leave for the garage. Stalled 4 or 5 times, was really hard to get started again and I gave up. Waiting for the tow truck now.

WTF is wrong with this thing

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99 Cherokee-2 door,5" lift on 35" KM2s
04 Grand Cherokee Overland
72 Chevy Nova-in progress
http://tiny.cc/BRASSBALLSOFFROAD
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post #58241 of 71286 Old 07-19-2014, 08:25 AM
cyoos
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Quote:
Originally Posted by gtg413i View Post
Just buy the bushing from Morris 4x4. Like $8. Had to do mine this year.
I'm still liking the thought of leaving it in neutral or 4Lo when it's parked and taking it with me as a theft deterrent.
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post #58242 of 71286 Old 07-19-2014, 08:31 AM
cyoos
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Quote:
Originally Posted by grandboost98 View Post
Well the cps must be good or it wouldn't run, right? The tach seems to be fine. I took readings from the O2 a couple weeks ago that looked good. Hopefully it's not the computer.

I thought I had picked up a tank of bad gas a week or 2 ago but I filled up at a few different stations since then and it seemed to be getting better. Then when I filled up with premium, the issue went away. Filled up with regular again and immediately spits and spudders almost worse than before






That was my first guess that maybe a couple weeks ago I did pick up bad gas and it gummed the filter up but it ran so good on premium I was starting to look for another answer.

I'll be heading to the garage soon to change the filter and see if I can figure anything else out


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Yes, it may still run with a bad cps. When mine went out a couple of years ago it started off intermittently. It would run fine, and then all of a sudden it would stumble occassionally. Then it got prgressively worse until it would barely run at all.

And squishy has a great point with the fuel filter too!
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post #58243 of 71286 Old 07-19-2014, 08:44 AM
grandboost98
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Quote:
Originally Posted by cyoos View Post
Yes, it may still run with a bad cps. When mine went out a couple of years ago it started off intermittently. It would run fine, and then all of a sudden it would stumble occassionally. Then it got prgressively worse until it would barely run at all.

And squishy has a great point with the fuel filter too!
Alright, thanks. I know I swapped the cps out a year or 2 ago so maybe I can get a new one on warranty.

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99 Cherokee-2 door,5" lift on 35" KM2s
04 Grand Cherokee Overland
72 Chevy Nova-in progress
http://tiny.cc/BRASSBALLSOFFROAD
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post #58244 of 71286 Old 07-19-2014, 09:06 AM
Michaelgoesrawr
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Quote:
Originally Posted by grandboost98
Could barely start it when I went to leave for the garage. Stalled 4 or 5 times, was really hard to get started again and I gave up. Waiting for the tow truck now. WTF is wrong with this thing Sent from AutoGuide.com Free App
Sounds like my 4.2 when the filter was clogged.

Adopt your pets. Don't shop for them.
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post #58245 of 71286 Old 07-19-2014, 09:13 AM
grandboost98
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Still waiting on the tow truck but god do I hope it's something as stupid as the fuel filter.

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89 Wrangler-3.5" HD BDS lift,M.O.R.E HD 5/8" booms on 35" KM2s
99 Cherokee-2 door,5" lift on 35" KM2s
04 Grand Cherokee Overland
72 Chevy Nova-in progress
http://tiny.cc/BRASSBALLSOFFROAD
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