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Old 05-15-2019, 08:38 AM
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Join Date: May 2019
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Jeep no fire no start

I have a 1988 Jeep YJ 6 cylinder 4.2 I just installed brand new distributor new coil and a new ignition control module still not getting any fire at the spark plugs and yes I am new to this form is there anyone out there that has any suggestions I'm what I should do next thank you

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Old 05-15-2019, 08:58 AM   #2
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Welcome to the forum.

I am not familiar with the 4.2 but I assume that you replaced the parts because of the same problem and are trying for an alternative approach rather than throwing more parts at it.

Confirm that you have battery voltage and a good ground connection at the ECM (if you don't have a wiring diagram find one).

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Old 05-15-2019, 03:43 PM   #3

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Welcome to the Forum Dingus70,

Since you're new to the forum, we don't know your mechanical experience.
I'll start with the basics. The crankshaft turns twice for a single turn of the camshaft, so it's real easy to install a distributor 180* out.

To find #1 Top Dead Center, remove the #1 spark plug and put a piece of tissue paper in the hole. With the coil wire unhooked, crank the engine bit by bit. When the tissue pops out, you're on the #1 compression stroke. Turn the engine over by hand (it's way easier if all the spark plugs are out) until the timing marks align. The rotor should be pointing to #1 cylinder on the distributor.
If that's what you have, then the engine should start. If it doesn't start, post again for more suggestions.

Good Luck, L.M.
"Wrangler....It's not just a vehicle, It's a lifestyle".
.................................................. ........................
1987 YJ-4.2L-Standard Shift- Re-manufactured Carter Carb-2" body Lift-31X10.5X15 BFG KOs-190K Miles No back seat.
HEI distributor with computer and all related relays and wiring removed.
12K Badlands winch with dual batteries.
Warn front bumper. Matching imitation Warn bumper on the rear.
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Old 05-16-2019, 11:38 PM
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Is there crank sensors or cam sensors on the 4.2 6 cylinders?
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Old 05-17-2019, 08:26 AM   #5
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Nope, Old school timing, computer mainly does emissions and idle
'89 YJ 4.2 with MC-2150 Carb & HEI, 2-1/2" Magnaflow Exhaust. BA-10, NP231, Adams front Diveshaft, SYE kit, 31x 10.5 x15 BFG KO's, 2 1/2" Rancho Spring kit, 1" Body Lift. RS5000x shocks, No emissions.

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