I need help. idle issues

[blu3fan]

already indexed the dizzy by cutting the ears.

[kario]

Check everything again.....including vacuum hoses. Keep checking over and over till you find the culprit. It's not going to be anything other than what's been mentioned in this thread already.

[blu3fan]

just a thought.
idk if its related. or bad. but i guess i should mention it.
i live in arizona currently. during summer the jeeps temps sitting idle could fluctuate between 200 and 210. driving settled to 190 ish,
its now not 115+ outside and at idle the jeep sits at 200. but while driving can get as low as 160 and wont fully heat up.
mind you i do have an upgraded radiator waterpump and a low temp thermo.
the car runs almost smooth at full temp.
i feel like idle sits around 500-600 rpm at idle if its not fully heated and 700 when fully heated.
im thinking whatever is causing this low idle may be related.
thoughts ?
just thinking with the cam being as harsh as it is the low idle on the cam could be causing the missing feeling ?
idk if its related or whether the temps fluctuation and idle are related.

[Cheromaniac]

its now not 115+ outside and at idle the jeep sits at 200. but while driving can get as low as 160 and wont fully heat up.
mind you i do have an upgraded radiator waterpump and a low temp thermo.

I can't think of any circumstance where you'd want a thermostat rated lower than 180* so if yours is a 160* unit, I suggest you change it.
At 160* the ECU will still be in closed loop but it's outside the optimum operating temp. range of the engine.

[SilverXJ]

x2. Replace the 160* tstat with a 180*. Engine life will increase. If you are concerned about over heating, the thermostat is not the place to make a change.

[RenoF250]

Yeah, go to at least a 180.

When you are not heating are you doing a lot of going downhill/engine braking? I have noticed mine will go pretty cold on a long downhill since the injectors are not firing at all.

[blu3fan]

it is a 180
i thought 195 was stock.

[SilverXJ]

yes, 195* is stock. The 160* you see, is this when coasting down a hill, or just regular around town driving?

I believed my injectors were 24lbs but looks like they are 22.45 this is a little out of my depth so any help understanding this would be awesome. and yes I understand air to fuel ratio. but me being super logic minded thinking. if I need bigger injectors still why would she be running rich ?
right ?

They work out to around 23 lbs/hr. Its hard to tell how the fit is without a wideband gauge, but them should be pretty good. They also shouldn't be causing your idle issues.

i feel like idle sits around 500-600 rpm at idle if its not fully heated and 700 when fully heated.

The 500-600 is normal for a hot engine. You should expect it to idle a bit higher when cold. 700 rpm is a bit high for a stock hot idle.

just thinking with the cam being as harsh as it is the low idle on the cam could be causing the missing feeling ?

The 68-231-4 cam should not be causing these problems. A noisy valve train, yes.

A wideband would help to see what it is doing while it is having the idle issues.

Run an unlit propane torch slowly around all the vacuum lines, throttle body and intake manifold and watch for an idle change. Also, spraying water at the same spots can help find a vacuum leak.

Have you tested the MAP sensor?

[blu3fan]

i have not tested the map sensor yet. and will be doing so today or Friday and will get back to you. after doing some research im hoping it may be the problem.

[blu3fan]

checked the vacuum line diagrams to make sure all lines are hooked up correctly. ( I replaced them all during the engine rebuild so I don't suspect a leak around here. unless its between the connections on the passenger side of the engine ( mind you it did pass the vacuum test for smog ) idk if that means the same thing tho, I think that's more on the emmissions side tho.
this may seem like something I should have checked.
thinking back to when I got the engine running for the first time I had a blocked fuel pressure regulator.
I replaced it with a junkyard run from one outa a 96.
I feel dumb for thinking about this now but is the fpr out of a 96 different ?
im thinking im gonna go do another junkyard run next week. I know there was a 93 last week I can grab the fpr outa.
looked it up on google part numbers look the same for fpr between 92 and 96 but want to clarify this with jeep experts.

[SilverXJ]

92 is a 39psi regulator. 96 should be a 49 PSI regulator, but it was one of those grey years. Speaking of which, what is your fuel pressure?

[blu3fan]

I ran a pressure test not too long ago and I believed it had good results.
ill swap out that fpr asap then

[beater_renix]

Forgive me for the necromancy... But I'm having similar problems.

I too have a Comp 68-231-4, and am having absurdly low idle. It's so low the Alternator kicks off. Did changing the FPR fix your problem?