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2001 Ford Focus missing in cylinder #4

Tiny
MAPLEGUY
  • MEMBER
  • 2001 FORD FOCUS
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 80,000 MILES
Missing in cylinder #4, runs very poorly, raw gas from tailpipe. Replaced plugs, wires, coil module, and #4 injector without curing the problem.
Sunday, April 26th, 2015 AT 7:36 PM

7 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,870 POSTS
Have you checked for spark and the actual compression on cylinder 4?
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Sunday, April 26th, 2015 AT 7:39 PM
Tiny
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Thanks for your quick reply. Yeah, spark and compression look good. I'm wondering now if I damaged the injector when installing. It was tough to get in. Will be pulling it this weekend.
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Monday, April 27th, 2015 AT 4:16 PM
Tiny
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Also check with the key in the run position if you have a constant power and ground to that injector holding it open causing the cylinder to flood with fuel.
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Monday, April 27th, 2015 AT 8:57 PM
Tiny
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Very odd results today. In reply to your suggestion, ALL of the injectors have 12V with the key in run position (pulled off the connectors and tested voltage at the sockets), what could this mean?

Removed and replaced the injectors, they all look good (not damaged, I know they could still be bad but as I mentioned I changed the one in #4).

I misspoke when I said compression is good, I thought it had been tested but not so. On this engine, the plugs are recessed, with the cams on either side. My friend's compression tester has a hose with a swivel connection so we can't get it tight into the threads when we pass it down the hole. Is there an adapter or a different style gauge to buy?
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Sunday, May 3rd, 2015 AT 12:01 PM
Tiny
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You will have a constant power with a pulsed ground that that opens the injectors. So with the key on engine off the none powered wires to the injectors are any they them have a constant ground?A normal compression with a long hose with the correct end to screw into the cylinders should work.
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Sunday, May 3rd, 2015 AT 5:28 PM
Tiny
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I don't know, but I'm guessing that the pulsed ground is too fast for a multimeter and I don't have a scope. However, I'm a happy guy because after fitting it all back together it is running properly. When I had the injectors out I renewed the o-rings, which I (stupidly) did not do originally. Must have had a sealing problem. Thanks for all your suggestions.
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Monday, May 4th, 2015 AT 3:33 PM
Tiny
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  • MECHANIC
  • 30,870 POSTS
To see the pulsed injector signal you would plug whats called a noid light it plugs into the injector harness then you crank the engine and watch the light flashing. Glad to hear you got it running good again.
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Monday, May 4th, 2015 AT 9:18 PM

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