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beShadeTree · May 20, 2007, 02:05 PM

Problem:
Engine runs but misfires on Cyl. 2 & 4. Fault Codes P1399, Misfire #2, Misfire #4.
Car was driven @ 45 mile in this condition, no power, engine shudder, CEL on for @ 30
Seconds then flashing. Tach. Working. Problem developed on morning start-up on 5/18

Testing Performed:

Drop Test - Cyl #1 engine dies, Cyl #2 no change, Cyl #3 engine dies, Cyl#4 very
Minor change. Good Spark at all cylinders.
K-Test - (4.88Vdc) at MAP connector.
Coil Test - Ohmed out within Specs.
ICM Pwr. Test - 12Vdc on Blk/Yel wire. Continuity on Blk/Yel, Yel/Grn, Blu back to
Connector. All three wire checked open to ground.

Parts Replaced:
Plugs - Very minor improvement engine still misfiring CEL flashing after 30 sec
Rotor - Very minor improvement engine still misfiring CEL Flashing after 30 sec
Cap - Very minor improvement engine still misfiring CEL Flashes after 30 sec
ICM - Engine runs rougher still misfiring CEL flashing after 30 sec

Question:
Could Timing Belt have jumped. It was replaced about a month and 1,000 miles ago?
On Compression Stroke what is the relationship between reluctor and pick-up at TDC?

I would appreciate any help with this problem. I'd really like to be sure all alternatives have been checked before replacing ECM. For lack of knowing what else, I plan to replace the Coil.

Thank you for your help

TxGreaseMonkey · May 20, 2007, 03:32 PM

Check spark plug wires--especially #2 and #4. However, odds are that the coil is bad. Bench testing coils usually proves little. Replacing the coil should solve the problem. After replacing coil, reset ECM and see if the problem is fixed. If this doesn't solve the problem, then you may have a bad CKP sensor and need to replace the distributor housing. Make sure you only use NGK spark plugs.

beShadeTree · May 20, 2007, 06:41 PM

Thanks for the info. Forgot to say I'd ohmed plug wire. They are in spec.

beShadeTree · May 23, 2007, 05:02 PM

Wahoo it's fixed!!

Just some useful information.

I know hind sight is 20/20 but, I wished I'd known. A brand NEW tested and ready to go distributor can be purchased for $220.00 from Roy Rogers Foreign Car Parts. I spent @ $180 foolin with the old one. I didn't want a remanufactured one. Once you cook(heat exposure) electronics they are going to fail. Heat is the main killer of all electronics.

The Distributor I got is a Richporter Technology. No used or reman. Parts.

TxGreaseMonkey · May 23, 2007, 07:21 PM

What lead you to suspect the distributor?