Should I advance the timing? - JeepForum.com
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post #1 of 27 Old 01-30-2014, 05:58 AM Thread Starter
97lerado97
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Should I advance the timing?

I am having a stalling problem that's been going on for over a month now. It only happens when I come to a full stop a little faster then normal. The idle will also drop very low when I put it in any gear. There has never been a check engine light and many parts were replaced iac, fuel pump filter and regulator alternator and battery plugs wires vac lines..I'm at the point where I want to advance the timing to Give it more gas and see if this helps. Is this a good idea? Has anyone played with the distributor on these jeep. It's a 5.2

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post #2 of 27 Old 01-30-2014, 07:06 AM
McCloudsZJ
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The timing in a 97 "lerado" is controlled by the computer. The distributor only goes on one way and is not adjustable.

March 2014 GCOTM. 1998 Deep Slate 5.9
On the Jeep:Hot intake, 52mm TB, Summit 8mm wires, catch can, 703s, insulated fuel rails, indexed Champions, Bilstein 4600s, Eibach lowering springs, Moog SS, Ironman mounts, Lotek 2GP, lots of gauges, sparkly paint.
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post #3 of 27 Old 01-30-2014, 07:18 AM
Mickey_D
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What you are describing points directly at the Idle Air Control. I know you already had it replaced, but I would investigate it further (wiring, PCM signal, grounds).

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post #4 of 27 Old 01-30-2014, 07:38 AM Thread Starter
97lerado97
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Quote:
Originally Posted by Mickey_D View Post
What you are describing points directly at the Idle Air Control. I know you already had it replaced, but I would investigate it further (wiring, PCM signal, grounds).
Wouldn't the check engine light come on if it were any of these? I'm running out of ideas
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post #5 of 27 Old 01-30-2014, 09:42 AM
ZeeJay1997
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the only way to get the distributor correctly aligned on a v-8 is with a scan tool. you can get it close by the tdc method, but you have to be able to see the relationship between the fuel and spark timing to get it nuts on.

did you clean the idle air chamber when you replaced the IAC?
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post #6 of 27 Old 01-30-2014, 09:58 AM Thread Starter
97lerado97
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Yes I cleaned the whole throttle body. This problem is bugging me out. I heard it could be the converter not releasing in time due to some solenoid but they also said if it was failing the check engine would of told me...
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post #7 of 27 Old 01-30-2014, 09:59 AM Thread Starter
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And the tranny fluid looks and smells fine.
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post #8 of 27 Old 01-30-2014, 10:12 AM
PolkaPower
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How about the cam sensor or crank sensor? Plenum gasket? Bad coil?
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post #9 of 27 Old 01-30-2014, 10:39 AM Thread Starter
97lerado97
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Cam or crank sensor should cause check engine light. The gasket would have had smoke come out when we tested it with the machine. How do you test the coil? I am getting 12 with the battery and alternator
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post #10 of 27 Old 01-30-2014, 10:47 AM
chetzar
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You keep saying it "should" cause a CEL, but it does not always cause a CEL. Plenty of people here have had the Cam/Crank sensor go back without a CEL. Also, you can check the status of your plenum gasket by opening the throttle body and looking for oil with a flashlight, if you see oil, its bad.
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post #11 of 27 Old 01-30-2014, 10:50 AM
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Quote:
Originally Posted by chetzar View Post
You keep saying it "should" cause a CEL, but it does not always cause a CEL. Plenty of people here have had the Cam/Crank sensor go back without a CEL. Also, you can check the status of your plenum gasket by opening the throttle body and looking for oil with a flashlight, if you see oil, its bad.
my thoughts exactly. these jeeps are old and not very advanced. i wouldnt be surprised if you cut some wires and the CEL still didnt come on.

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post #12 of 27 Old 01-30-2014, 10:52 AM
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I'm just going to say this about the plenum gasket. If it hasn't ever been repaired, it's bad. There are no lucky exceptions to that. It was a factory flaw.
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post #13 of 27 Old 01-30-2014, 10:55 AM Thread Starter
97lerado97
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Thank you I just needed someone to say it lol. I will replace the gasket tonight...can I check those sensors with a scanner (ethos) or just check the volts
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post #14 of 27 Old 01-30-2014, 01:18 PM
PolkaPower
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You do know what the plenum gasket is right? Takes several hours do. Best to start in the morning on your day off.
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post #15 of 27 Old 01-30-2014, 01:46 PM Thread Starter
97lerado97
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Intake manifold gasket...yeah just ordered it should be in tomorrow.
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