Rough idle
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Cross-Country
Joined: Sep 2017
Posts: 88
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Rough idle
I just purchased a 2002 E350 with the 6.8 V10. 242k miles on it, the owner said the plugs had never been changed. His title said 136k when he bought it.
I pulled all the plugs and replaced them, along with the air filter that was rather nasty. It also had codes of P0113 (intake air temp), P0102 (mass air flow sensor circuit low), and P0307 (cyl 7 misfire). I cleared the codes after reading them.
Just got it all back together with the new plugs and air filter, cleaned the MAF, and it is idling about the same. Seems like it pulls better up top, but the idle is rough. Almost feels like a muscle car with an aggressive cam in it.
What should I be looking at next?
I pulled all the plugs and replaced them, along with the air filter that was rather nasty. It also had codes of P0113 (intake air temp), P0102 (mass air flow sensor circuit low), and P0307 (cyl 7 misfire). I cleared the codes after reading them.
Just got it all back together with the new plugs and air filter, cleaned the MAF, and it is idling about the same. Seems like it pulls better up top, but the idle is rough. Almost feels like a muscle car with an aggressive cam in it.
What should I be looking at next?
Lead Driver
Joined: Mar 2013
Posts: 7,460
Likes: 85
From: Kent Station, WA
Before replacing everything, knowing how expensive that can be clean the IACV with Seafoam through the brake booster hose, check the PCV valve and elbow hose attaching it to the throttle body. Sometimes these crack and create a vacuum leak. If you need coil packs use Denso they are the OEM manufacturer and far less expensive than Motorcraft. 
Edit: Have you changed the Fuel Filter?
Edit: Have you changed the Fuel Filter?
Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
I realize replacing parts is expensive, but with the miles you have it just makes sense.
Try to clean a IAC with 250k miles on it may work, but may work and then stick again soon. Now your back in the same boat. Once all the maintenance has been done you can diagnose any remaining issues easier.
Chasing around hoping all coils are good and narrowing down a bad plug is very time consuming and difficult.
Do the plugs, coils, injectors, IAC,fuel filter, fuel pressure regulator, sensors. I would also put a new fuel pump in......I know it's not a maintenance item but it has alot of miles on it and it not got much time left.
While your at it put new injector clips on all 10 spots, they tend to get brittle and break. And it's not a bad idea to put in 2 new O2 sensors.
Load test battery and take alternator off and have it tested. A bad charging system will affect fuel pressure.
Oh, and oNE last thing....pull all fuses and replace with new ones.
Try to clean a IAC with 250k miles on it may work, but may work and then stick again soon. Now your back in the same boat. Once all the maintenance has been done you can diagnose any remaining issues easier.
Chasing around hoping all coils are good and narrowing down a bad plug is very time consuming and difficult.
Do the plugs, coils, injectors, IAC,fuel filter, fuel pressure regulator, sensors. I would also put a new fuel pump in......I know it's not a maintenance item but it has alot of miles on it and it not got much time left.
While your at it put new injector clips on all 10 spots, they tend to get brittle and break. And it's not a bad idea to put in 2 new O2 sensors.
Load test battery and take alternator off and have it tested. A bad charging system will affect fuel pressure.
Oh, and oNE last thing....pull all fuses and replace with new ones.
Cargo Master
Joined: Apr 2013
Posts: 3,087
Likes: 24
From: Central Florida
temp sensor $30?
MAF $80..?
injectors $500..?
IAC $100
dude that's almost $1500. That's a very high priced baseline.
Come on Rock2610D.
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Cargo Master
Joined: Apr 2013
Posts: 3,087
Likes: 24
From: Central Florida
I realize replacing parts is expensive, but with the miles you have it just makes sense.
Try to clean a IAC with 250k miles on it may work, but may work and then stick again soon. Now your back in the same boat. Once all the maintenance has been done you can diagnose any remaining issues easier.
Chasing around hoping all coils are good and narrowing down a bad plug is very time consuming and difficult.
Do the plugs, coils, injectors, IAC,fuel filter, fuel pressure regulator, sensors. I would also put a new fuel pump in......I know it's not a maintenance item but it has alot of miles on it and it not got much time left.
While your at it put new injector clips on all 10 spots, they tend to get brittle and break. And it's not a bad idea to put in 2 new O2 sensors.
Load test battery and take alternator off and have it tested. A bad charging system will affect fuel pressure.
Oh, and oNE last thing....pull all fuses and replace with new ones.
Try to clean a IAC with 250k miles on it may work, but may work and then stick again soon. Now your back in the same boat. Once all the maintenance has been done you can diagnose any remaining issues easier.
Chasing around hoping all coils are good and narrowing down a bad plug is very time consuming and difficult.
Do the plugs, coils, injectors, IAC,fuel filter, fuel pressure regulator, sensors. I would also put a new fuel pump in......I know it's not a maintenance item but it has alot of miles on it and it not got much time left.
While your at it put new injector clips on all 10 spots, they tend to get brittle and break. And it's not a bad idea to put in 2 new O2 sensors.
Load test battery and take alternator off and have it tested. A bad charging system will affect fuel pressure.
Oh, and oNE last thing....pull all fuses and replace with new ones.
New fuses?!
Youre getting a little crazy man.
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Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
https://www.densoproducts.com/product.aspx?zpid=13762
Remaned injectors $80 on ebay with 5 yr warrenty.
https://www.ebay.com/i/251340254943?chn=ps&dispItem=1&ul_ref=http%253A%25 2F%252Frover.ebay.com%252Frover%252F1%252F711-117182-37290-0%252F2%253Fmpre%253Dhttps%25253A%25252F%25252Fwww .ebay.com%25252Fi%25252F251340254943%25253Fchn%252 53Dps%252526dispItem%25253D1%2526itemid%253D251340 254943%2526targetid%253D362377239340%2526device%25 3Dm%2526adtype%253Dpla%2526googleloc%253D9029233%2 526poi%253D%2526campaignid%253D936422846%2526adgro upid%253D55174491988%2526rlsatarget%253Dpla-362377239340%2526abcId%253D1129656%2526merchantid% 253D114741197%2526gclid%253DEAIaIQobChMIg_GI9bDd1g IVhIBpCh25-QC9EAQYASABEgKlcfD_BwE%2526srcrot%253D711-117182-37290-0%2526rvr_id%253D1328993772456
IAC $67 motorcraft on ebay.
https://m.ebay.com/itm/Idle-Air-Control-Valve-fits-97-02-Ford-E-350-Econoline-Club-Wagon-6-8L-V10-/351773588353?fits=Make%3AFord&epid=76154222&hash=i tem51e756fb81%3Ag%3AOZ8AAOSwB31Zodqt&_trkparms=pag eci%253Af28ee48e-ab00-11e7-8477-74dbd1805b95%257Cparentrq%253Af48096d515e0aa471f8b 02adffff6cd5%257Ciid%253A12
Not sure where some shop, but dude if you pay $1500 for your stuff your paying too much.
Cargo Master
Joined: Apr 2013
Posts: 3,087
Likes: 24
From: Central Florida
Denso coils $244 on ebay that's who make OEM units.
https://www.densoproducts.com/product.aspx?zpid=13762
Remaned injectors $80 on ebay with 5 yr warrenty.
https://www.ebay.com/i/251340254943?chn=ps&dispItem=1&ul_ref=http%253A%25 2F%252Frover.ebay.com%252Frover%252F1%252F711-117182-37290-0%252F2%253Fmpre%253Dhttps%25253A%25252F%25252Fwww .ebay.com%25252Fi%25252F251340254943%25253Fchn%252 53Dps%252526dispItem%25253D1%2526itemid%253D251340 254943%2526targetid%253D362377239340%2526device%25 3Dm%2526adtype%253Dpla%2526googleloc%253D9029233%2 526poi%253D%2526campaignid%253D936422846%2526adgro upid%253D55174491988%2526rlsatarget%253Dpla-362377239340%2526abcId%253D1129656%2526merchantid% 253D114741197%2526gclid%253DEAIaIQobChMIg_GI9bDd1g IVhIBpCh25-QC9EAQYASABEgKlcfD_BwE%2526srcrot%253D711-117182-37290-0%2526rvr_id%253D1328993772456
IAC $67 motorcraft on ebay.
https://m.ebay.com/itm/Idle-Air-Control-Valve-fits-97-02-Ford-E-350-Econoline-Club-Wagon-6-8L-V10-/351773588353?fits=Make%3AFord&epid=76154222&hash=i tem51e756fb81%3Ag%3AOZ8AAOSwB31Zodqt&_trkparms=pag eci%253Af28ee48e-ab00-11e7-8477-74dbd1805b95%257Cparentrq%253Af48096d515e0aa471f8b 02adffff6cd5%257Ciid%253A12
Not sure where some shop, but dude if you pay $1500 for your stuff your paying too much.
https://www.densoproducts.com/product.aspx?zpid=13762
Remaned injectors $80 on ebay with 5 yr warrenty.
https://www.ebay.com/i/251340254943?chn=ps&dispItem=1&ul_ref=http%253A%25 2F%252Frover.ebay.com%252Frover%252F1%252F711-117182-37290-0%252F2%253Fmpre%253Dhttps%25253A%25252F%25252Fwww .ebay.com%25252Fi%25252F251340254943%25253Fchn%252 53Dps%252526dispItem%25253D1%2526itemid%253D251340 254943%2526targetid%253D362377239340%2526device%25 3Dm%2526adtype%253Dpla%2526googleloc%253D9029233%2 526poi%253D%2526campaignid%253D936422846%2526adgro upid%253D55174491988%2526rlsatarget%253Dpla-362377239340%2526abcId%253D1129656%2526merchantid% 253D114741197%2526gclid%253DEAIaIQobChMIg_GI9bDd1g IVhIBpCh25-QC9EAQYASABEgKlcfD_BwE%2526srcrot%253D711-117182-37290-0%2526rvr_id%253D1328993772456
IAC $67 motorcraft on ebay.
https://m.ebay.com/itm/Idle-Air-Control-Valve-fits-97-02-Ford-E-350-Econoline-Club-Wagon-6-8L-V10-/351773588353?fits=Make%3AFord&epid=76154222&hash=i tem51e756fb81%3Ag%3AOZ8AAOSwB31Zodqt&_trkparms=pag eci%253Af28ee48e-ab00-11e7-8477-74dbd1805b95%257Cparentrq%253Af48096d515e0aa471f8b 02adffff6cd5%257Ciid%253A12
Not sure where some shop, but dude if you pay $1500 for your stuff your paying too much.
for dramatic effect.
$80 for injectors? Is that each, or for the set of 10?
good call on the Denso coils.
Thread Starter
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Cross-Country
Joined: Sep 2017
Posts: 88
Likes: 0
Battery is brand new, though I still need to replace the terminals.
I forgot to mention, but it stalls on first cold start. I need to give it throttle to keep it going at first, which now seems like the IACV. I can't see the other end, but you are saying the brake booster hose leads to it, and i can dump some seafoam down that line to clean it?
I just had shoulder surgery yesterday, so replacement of parts will have to wait a few weeks. I've only got one good arm for the time.
I appreciate the feedback.
I forgot to mention, but it stalls on first cold start. I need to give it throttle to keep it going at first, which now seems like the IACV. I can't see the other end, but you are saying the brake booster hose leads to it, and i can dump some seafoam down that line to clean it?
I just had shoulder surgery yesterday, so replacement of parts will have to wait a few weeks. I've only got one good arm for the time.
I appreciate the feedback.
Thread Starter
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Cross-Country
Joined: Sep 2017
Posts: 88
Likes: 0
After poking around the internet, so i knew what the Ford IACV looks like, I found it on the very back of the engine. Conveniently right under the doghouse. Sprayed it with some intake cleaner, and the idle changed. So I may just replace that, but I am going to drive it a bit first. Fairly easy to replace on the van.
Thread Starter
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Cross-Country
Joined: Sep 2017
Posts: 88
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Cleaning the IACV allowed it to cold start without the aid of throttle today. Drove around a bit, and got some codes.
P0171 system too lean bank 1
P0174 system too lean bank 2
P0307 cyl 7 misfire
Seems like maybe the coil on 7 might be bad since that keeps coming back(if I move that coil and the misfire moves, I have my answer). Certainly need to change the fuel filter still.
P0171 system too lean bank 1
P0174 system too lean bank 2
P0307 cyl 7 misfire
Seems like maybe the coil on 7 might be bad since that keeps coming back(if I move that coil and the misfire moves, I have my answer). Certainly need to change the fuel filter still.
Fleet Mechanic
Joined: Mar 2013
Posts: 1,576
Likes: 41
From: Wyoming
Lean on both banks implies pcm cannot push enough gas to the motor, or its sucking alot of Un metered air, or you have huge exhaust leaks before the O2 sensors.
Fuel filter, fuel pressure regulator, fuel pump, vacuum leak, are where I would start.
Fuel filter, fuel pressure regulator, fuel pump, vacuum leak, are where I would start.