Can it really be the cylinder down?

Tiny
RMOORE
  • MEMBER
  • 1997 FORD EXPLORER
  • 225,000 MILES
My explorer is missing very badly. We used a computer and it gave us an EGR code but the mechanic is saying the # 4 cylinder is down.
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Thursday, April 5th, 2012 AT 8:42 PM

4 Replies

Tiny
CARADIODOC
  • EXPERT
Do a compression test or cylinder leakage test to determine the cylinder's compression. There's lots of EGR codes so you have to be more specific. If it's related to flow, Ford has had a lot of trouble with the passages plugging with carbon. As they do, exhaust gas flow is restricted to them so they run especially fine because they'll be getting only fresh air and fuel. Eventually all of the EGR flow goes to the one last cylinder that isn't plugged and it misfires because it's getting ALL of the volume that was intended to be split up among all the cylinders. To say it a different way, the last good cylinder is the one that has the misfire.
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Thursday, April 5th, 2012 AT 9:08 PM
Tiny
RMOORE
  • MEMBER
Thanks for responding! The actual code was EGRP1400 which has something to do with the flow to the catalyst. Don't know what means myself though. The mechanic did a compression test and said it was the # 4 cylinder. He is checking to see if the injector is just not providing fuel which I am assuming I should be hoping for that and not that the cylinder has decided to die.
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Friday, April 6th, 2012 AT 1:15 PM
Tiny
WRENCHTECH
  • EXPERT
The coils are the common failures on those.
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Friday, April 6th, 2012 AT 1:32 PM
Tiny
CARADIODOC
  • EXPERT
Good point. Thanks Wrenchtech. Unless your mechanic is a real dummy, he will probably switch two coils to see if the problem goes to a different cylinder. The same can be done with two injectors but it takes a little longer.

Normally if compression is the problem, there's going to be other symptoms besides just a misfire. For sure if it's an intermittent problem, it's not compression-related because anything broken or worn won't fix itself once in a while.
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Friday, April 6th, 2012 AT 6:58 PM

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