1999 Jeep Wrangler MISSING

KS30752

MEMBER
1999 JEEP WRANGLER
4 CYL
4WD
AUTOMATIC
120,000 MILES

HAD AT SHOP THEY CHANGED PLUG AND WIRES CAP, ROTOR BUTTON, CAMSHAFT SENSOR, CRANK SENSOR, THROTTLE POSTION SENSOR AND IT STILL READS MISS FIRE ON # 1 AND #3 CYLINDER WHAT COULD IT BE.

Thursday, December 6th, 2007 AT 3:40 PM

3 Replies

2CARPRO JACK

MECHANIC
11,533 POSTS

As long as the firing order is correct, I would look at the injectors. Unplug them and using a meter, check the resistance across the injector, should be 10.8 - 13.2 ohms @ 68 degrees F. Even if measured good, could be bad. Pull and inspect plug color as well, compare 1, 3 to 2, 4

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Friday, December 7th, 2007 AT 8:06 AM

KS30752

MEMBER
2 POSTS

THEY SAID THAT IT NEEDS A COMPUTER !THE ONLY THING LEFT TO WORK THE FIRING ORDER IS THE COMPUTER. THEY SAID THAT THEY HAD CHANGED THE INJECTORS. ENGINE MISSES ON ALL 4 CYLINDERS. COMPUTER SHOWS MULTIPLE MISS FIRE ON 1 2 3 4.

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Friday, December 7th, 2007 AT 2:27 PM

2CARPRO JACK

MECHANIC
11,533 POSTS

If it has a distributor cap, then it has a firing order. Changed injectors and now it misses on all 4 cylinders? What codes has this Jeep stored in the PCM? This sounds strange.

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Friday, December 7th, 2007 AT 3:42 PM