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Old 05-05-2013, 11:49 AM   #1
swagfocuswagon
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SPI Issue.

Hey guys!

Basically when i go to start the car in the morning (or cold) it fires right up with no problem. I go to make a trip and the engine warms up. After about 5minuts i go back to the car after my trip. Engine is completely warmed up by now. Car starts, but fumbles. Almost like its gonna die. It does this for about 15 seconds. Then it runs fine. If I have a load on it sometimes it stalls. If i give it some gas it runs fine but as soon as I let off it starts running really rough for that 15 or so seconds.

This car is making me nuts.

I have replaced the alternator several times. Battery is still good. Wiring is good. Added a few grounds, ect. I cant seem to figure out whats wrong with it.

If anyone can chime in, please do. I can give more info if needed.

Thanks, Patrick.


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Old 05-05-2013, 11:52 AM   #2
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Also I got this weird glitch when its idling it will "miss" for a second and will do it intermittently. Also when driving especially on take off it when I give it gas it will act like its running on 2 cylinders. If I let off the throttle a little bit it stops and then runs fine. Im afraid this thing is gonna get me killed lol
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Old 05-06-2013, 10:43 AM   #3
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Moved to "General Technical Chat" so you can get better answers for your questions.
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Old 05-07-2013, 08:02 AM   #4
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Okay thanks!
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Old 05-07-2013, 08:53 AM   #5
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Check your coil. They are known to crack and let in moister and will run like crap. Also pull out your pcv valve and see if it rattles if it does than its good but if not replace it as well as the tube going to it look for any cracks that may be causing a vacuum leak. That would be your two easiest and cheapest fixes.

After that look at idle air control valve, and throttle postion sensor.

Btw go with motorcraft coil it never hurts to keep it with a stock ford parts.

Sent from 34.0764 N, 118.4296 W
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Old 05-10-2013, 01:16 PM   #6
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I replaced the coil when I did my tune up for that reason. Its not a MotorCraft but it does the job. I dont doubt its defective though.

This car is been nothing but a living hell. Its a nice ride and all but its making me nuts.

But I will look at those things. Thanks for the suggestions.

I fixed my batt. light. A wire on the alternator pig tail was broken in half (corrosion) so I crimped and heat shrank it.
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Old 05-10-2013, 04:15 PM   #7
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Quote:
Originally Posted by TheGlassMaker View Post
Check your coil. They are known to crack and let in moister and will run like crap. Also pull out your pcv valve and see if it rattles if it does than its good but if not replace it as well as the tube going to it look for any cracks that may be causing a vacuum leak. That would be your two easiest and cheapest fixes.

After that look at idle air control valve, and throttle postion sensor.

Btw go with motorcraft coil it never hurts to keep it with a stock ford parts.

Sent from 34.0764 N, 118.4296 W
First thing that popped into my head was the idle air control valve/sensor and the throttle position sensor. I would definitely check those.
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Old 05-10-2013, 05:44 PM   #8
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Quote:
Originally Posted by swagfocuswagon View Post
I replaced the coil when I did my tune up for that reason. Its not a MotorCraft but it does the job. I dont doubt its defective though.

This car is been nothing but a living hell. Its a nice ride and all but its making me nuts.

But I will look at those things. Thanks for the suggestions.

I fixed my batt. light. A wire on the alternator pig tail was broken in half (corrosion) so I crimped and heat shrank it.
I wouldn't count on it. My aftermarket coil went bad 2 months after installing. Put the motorcraft back in and was fine. Mine was cutting out typically in the cooler weather and was fine when it got warmed up. Ran alot smoother with the newer coil when it was missing though!!
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Old 05-10-2013, 05:50 PM   #9
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Have u done a compression test? Do you know about the SPI issues? A lack of compression might explain why it acts different warm than cold.
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Old 05-10-2013, 05:58 PM   #10
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Odds are though, if coil changed and problem stayed the same, then not coil.

Check the PCV hose in BACK of motor where it goes into the intake, commonly sucks a hole to do just what you describe.

A PCV valve can rattle and still be bad. The rattle is the poppet rattling around in the bigger orifice, there can be a smaller one that gets stopped up but valve will still rattle. Rattle means the valve works fine at high speed but it may not work fine at idle. Depends how valve made inside............I don't like to change PCV valves, the one in motor is commonly metered finer than ones you buy, I always throw the valve in acetone for a day or two to soften deposits and then blow the daylights out of it with compressed air. Haven't bought one in like 30 years now.
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