Can someone give me a quick how to on engine timing?
11-28-2011, 09:35 PM
#1
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Year: 1994
Model: Cherokee
Engine: i6 HO
Can someone give me a quick how to on engine timing?
I have the 4.0HO i6 and it think it needs a timing... how should i go about this? Ive done timing before but want to do it right.
I heard/read something that i shouldnt start twisting the distrib cause of the PCM and what not. So kinda scared about that. What should i do to time my engine? I was going to loosen the distrib and twist it a little with a timing let set up to watch the mark... and set it 2* ahead.
I heard/read something that i shouldnt start twisting the distrib cause of the PCM and what not. So kinda scared about that. What should i do to time my engine? I was going to loosen the distrib and twist it a little with a timing let set up to watch the mark... and set it 2* ahead.
11-28-2011, 09:43 PM
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Model: Cherokee
You can't set engine timing on any of the 4.0 or 2.5 Jeep engines. Its all done electronically by the ECU
You can set the static time if you have removed the dizzy and forgot to set #1 piston on TDC compression stroke and forgot to mark the rotor location on the dizzy housing before removal
On the RENIX models you can get a high altitude CPS that will advance timing by a few degrees.
Also, you can't twist the 4.0 dizzy, it has a mounting tab on it and it wouldn't make any difference any way, the ECU will re compensate for the relocation.
You can set the static time if you have removed the dizzy and forgot to set #1 piston on TDC compression stroke and forgot to mark the rotor location on the dizzy housing before removal
On the RENIX models you can get a high altitude CPS that will advance timing by a few degrees.
Also, you can't twist the 4.0 dizzy, it has a mounting tab on it and it wouldn't make any difference any way, the ECU will re compensate for the relocation.
Last edited by xjtrailrider; 11-28-2011 at 09:46 PM.
11-28-2011, 09:59 PM
#4
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Year: 1997
Model: Cherokee
Engine: 4.0, comp cam, 99 intake, apn header, neon injectors, Thunderbolt 2.5" High Flow Cat
plugs, wires, cap, rotor. If it's still doing it check your cam position sensor and crank position sensor, as well as your injectors.
11-28-2011, 10:27 PM
#7
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Year: 1997
Model: Cherokee
Engine: 4.0, comp cam, 99 intake, apn header, neon injectors, Thunderbolt 2.5" High Flow Cat
lol, the cam position sensor is that plastic plate thing under need the rotor in the distributor, and the crank position sensor is mounted in the back of the engine near the bell housing. I'd honestly start with the tune up and maybe a good throttle body cleaning. Plugs, wires, cap and rotor.
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11-28-2011, 10:30 PM
#8
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Year: 1988
Model: Comanche
Engine: 4.0L Inline 6
Originally Posted by 4x4cherokeexj
What do i exactly do to check these sensors and where are they?
11-29-2011, 10:00 AM
#9
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Year: 96
Model: Cherokee
Engine: 4.0
Do a quick compression check too. If it was overheated a blown head gasket could cause it to run on 4 cylinders. It can blow just between two cylinders and not to a coolant port so you would not have any other evidence of a blown head gasket other than two cylinders not firing.
12-01-2011, 02:57 PM
#11
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Year: 1994
Model: Cherokee
Engine: i6 HO
Do a quick compression check too. If it was overheated a blown head gasket could cause it to run on 4 cylinders. It can blow just between two cylinders and not to a coolant port so you would not have any other evidence of a blown head gasket other than two cylinders not firing.
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