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Old 02-22-2011, 06:51 AM
Ian MacFarlane Ian MacFarlane is offline
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Default Bad ignition coil and spark plugs

Hi, I'm Ian, a retired guy. I have a 2006 Ranger with the 3.0 engine. Saturday it started running rough and had no torque. The engine just about stalled when I stopped for a light. (Automatic tranny). I used my code reader and got P0352 = defective ignition primary and secondary coil. I bought a new coil and six new spark plugs and changed the coil and plugs. The old plugs had very eroded central electrodes and the gaps had enlarged to some 60-70 thousandths (0.044 is the spec). When I started the truck after doing the replacement it still ran rough and had no pickup. Then I cleared the codes and it ran like a champ -- for just over one day. Monday it ran great for the first hour and then, in the middle of the freeway, I could not hold speed and dropped off to below 65. When I stepped on the gas the tach showed an increase to almost 4000 RPM but my speed stayed at just below 65. There was a lack of response to acceleration and, as I got off the road and down to a stop sign, the engine was running rough. (No check-engine light). I parked it at work and a few hours later I started it and it runs fine. No codes and just the apparent disconnect between the RPM and the speed that one time. Oh, yes, between the time I got off the freeway and made it to work the truck would only shift when I got the RPM up above 2500 and backed off on the gas. Then it would up-shift. Downshift was OK.

Any ideas? Seems intermittent.
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Old 02-22-2011, 07:13 AM
modelageek modelageek is offline
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Default Re: Bad ignition coil and spark plugs

Quote:
Originally Posted by Ian MacFarlane View Post
Hi, I'm Ian, a retired guy. I have a 2006 Ranger with the 3.0 engine. Saturday it started running rough and had no torque. The engine just about stalled when I stopped for a light. (Automatic tranny). I used my code reader and got P0352 = defective ignition primary and secondary coil. I bought a new coil and six new spark plugs and changed the coil and plugs. The old plugs had very eroded central electrodes and the gaps had enlarged to some 60-70 thousandths (0.044 is the spec). When I started the truck after doing the replacement it still ran rough and had no pickup. Then I cleared the codes and it ran like a champ -- for just over one day. Monday it ran great for the first hour and then, in the middle of the freeway, I could not hold speed and dropped off to below 65. When I stepped on the gas the tach showed an increase to almost 4000 RPM but my speed stayed at just below 65. There was a lack of response to acceleration and, as I got off the road and down to a stop sign, the engine was running rough. (No check-engine light). I parked it at work and a few hours later I started it and it runs fine. No codes and just the apparent disconnect between the RPM and the speed that one time. Oh, yes, between the time I got off the freeway and made it to work the truck would only shift when I got the RPM up above 2500 and backed off on the gas. Then it would up-shift. Downshift was OK.

Any ideas? Seems intermittent.
use the code reader and try and catch a pending code?
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2004 Ext Cab, 4WD, 4.0, Auto, 154k. (4.0 engine is out of a 2009 Ranger w/96k) ( as of 7/1/2017)

2004 Ranger, Ext Cab, 2WD, 3.0, 5 speed , 4WABS, crank windows, no cruise, Edge 116k.(6/5,2014) (SOLD).
1999 Ford Ranger, Reg Cab, 2.5, 5 speed, 2WD, no AC, 150k (SOLD).
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