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  #11  
Old 05-02-2013, 11:56 AM
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i dont see a problem with the truck if it always happens at same spot take different route and see what happens every truck has it quirks mine cant get wet under hood or she gets really pissed off about that
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Old 05-02-2013, 01:20 PM
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I believe the reason it's the same spot every time is because it's when the truck switches from open loop to closed loop like I explained above. Doesn't matter where you drive, it will still do it. There are several constraints, one is time. The vehicle will stay in open loop for X amount of seconds upon start up. The other main constraint is coolant temperature.
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  #13  
Old 05-02-2013, 02:32 PM
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Ya what he said^^^^ and does the v10 have 4cats?
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Old 05-02-2013, 02:33 PM
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^I'm not sure..............
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Old 05-02-2013, 11:01 PM
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The truck has 2 cats. I just took a look and only see 2, O2 sensors in front of the cats, nothing behind them. The cats do have a rattle but I would assume that would only affect power and I cannot imagine they would cause a problem like I am having.

I have checked codes in the past, not exactly sure what they were exactly but the codes were injector misfire codes and it was a different cylinder every time.

What is a CEL?

Truck has a MAP sensor which I just replaced, no MAF sensor
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Old 05-02-2013, 11:12 PM
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CEL is check engine light. Get autozone or some other shop to scan the codes(they do it free). Write the codes down and post them here. You could have a bad pcm if it's a random misfire.

Does that engine have an individual coil for each cylinder? Or does it have a distributor?

The code(s) will give the info needed to diagnose the issue. Don't let the parts guy at the counter tell you his diagnosis, they are usually wrong. Just write down the actual codes and post them here. I'd be very surprised if there were no post cat O2 sensors on a 1999...actually, that's OBD2 so I"m pretty sure it has to have them.
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  #17  
Old 05-02-2013, 11:28 PM
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CEL has only come on twice in 3 years. I will get the codes checked this weekend.

I will also look for more O2 sensors.

It has 2 coil packs a 4 wire and a 6 wire.
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  #18  
Old 05-03-2013, 01:15 AM
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I believe there are two more 02 sensors forward of the two you see by the cats. Those are the rear sensors.
I agree the CEL will tell the story. If you have cats rattling then you have BAD cats. Bad cats can cause interesting problems. If there rattling they are loose inside & could slide to a place of possible particle blockage at times.
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  #19  
Old 05-03-2013, 01:31 AM
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There can be stored codes that dont show up as a CEL.
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  #20  
Old 05-03-2013, 11:44 AM
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sounds like the Crankshaft Position Sensor to me
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