Rough Idle on Possible Purchase - Ford Powerstroke Diesel Forum
 
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post #1 of 6 Old 08-15-2014, 04:11 AM Thread Starter
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Rough Idle on Possible Purchase

I've found a truck that appears to be in good condition but runs rough. It is a 2000 7.3 with 97k. The current owner used it to commute to his office that was a mile from his house and has only put on 1k a year for the past 2 years. He assumes the truck needs injectors due to the lack of use. The truck is priced right and the owner has a new truck so I think I can get a very good deal on it.

Is this a likely cause and explanation? What else could need replacing due to this low use?

And if I do buy it, what maintenance items would you immediately address (beyond the typical ones for any used vehicle)?

Thanks
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post #2 of 6 Old 08-15-2014, 05:50 AM
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First change the fuel filter, then have the tank dropped and cleaned, I just had my trucks tanked dropped and the pick up foot was broken off and the 2 filters in the tank where plugged up also, now that those are clean it idle's really well now. Also check the ICP, it is located on the driver side cylinder head near the front, pop off the plug and check for oil, I also had too change mine, and it also helped with the way the truck ran.

Ask the PO if he ever added any fuel additive, if not run some Diesel Kleen in the tank for a few tank full's, this will help clear the injectors.

If you do buy the truck, change ALL the fluids,
oil and filter
Fuel filter
Coolant flush
Transmission flush, and filter
Rear gear lube
Power steering flush
Replace the air filter (Airaid, S&B, AFE)

I'm sure I missed something but someone else will catch it.

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post #3 of 6 Old 08-15-2014, 09:52 AM Thread Starter
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Good advice, I hadn't thought to check the tank pickups.
If there is oil on the ICP, should it just be changed for a new one or is there a reason oil got to it? (ie. seals/gaskets to replace also). Sorry, I understand the function of the ICP sensor, just not how it actually integrates.

I'm hoping to buy the truck priced for a full injector job but was hoping to try some additive and maybe get lucky, as you said.
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post #4 of 6 Old 08-15-2014, 10:14 AM
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Originally Posted by Lt.Dan View Post
Good advice, I hadn't thought to check the tank pickups.
If there is oil on the ICP, should it just be changed for a new one or is there a reason oil got to it? (ie. seals/gaskets to replace also). Sorry, I understand the function of the ICP sensor, just not how it actually integrates.

I'm hoping to buy the truck priced for a full injector job but was hoping to try some additive and maybe get lucky, as you said.
Yes, change the ICP if it has oil in the connector it's bad. You will need a 5/8" crow's foot too remove the old on if it's the original stock one, and you will need a 1 1/16" socket for the new one, and it take's like 10 minutes too swap out.

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post #5 of 6 Old 08-15-2014, 10:32 AM

 
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Quote:
Originally Posted by Lt.Dan View Post
I've found a truck that appears to be in good condition but runs rough. It is a 2000 7.3 with 97k. The current owner used it to commute to his office that was a mile from his house and has only put on 1k a year for the past 2 years. He assumes the truck needs injectors due to the lack of use. The truck is priced right and the owner has a new truck so I think I can get a very good deal on it.

Is this a likely cause and explanation? What else could need replacing due to this low use?

And if I do buy it, what maintenance items would you immediately address (beyond the typical ones for any used vehicle)?

Thanks
Just remove the ICP sensor and start it. If it runs better, then you know the culprit. It could be injectors, it could be an injector harness, stuck ebpv, filters, etc.

If the owner will let you, take it to a known good shop that knows the 7.3 fairly well and just have them scan for codes, do an injector buzz test, cylinder contribution test, and take it for a drive with live diagnostics to see what your oil pressures are, lpop and hpop, hpop duty cycle.

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Part numbers will help alot too if they are not on our site.
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post #6 of 6 Old 08-15-2014, 07:03 PM Thread Starter
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Excellent info from everyone here, thank you for that. The truck is about 2hrs away from me so I will have to locate a good shop. (western MA, if anyone knows the area)
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