Ford :: 1997 - Cylinder 1 And 6 Not Firing?


Oct 10, 2013

Diagnostic says 1 and 6 are not firing. Car runs rough slightly. I think one of them is intermittently firing the other maybe not at all.

Possible causes according to diagnostic:

coil, plugs, injector, vacuum leak, wires (From memory)

Gas mileage is excellent. This makes me think its injectors. Failing plugs or wires would cause massive gas loss through misfiring cylinder.

Just bought this car. The seller said the wires and plugs are new. I will inspect tomorrow when I do the brakes.

Assuming they were replaced it leaves coil, vacuum or injectors.

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Problem is that cylinder #6 is not firing when engine is hot at operating temperature. Engine shakes lightly but performance remains good.

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I've replaced the plug, and distributor cap. I've also confirmed with the plug out of the block that it is firing.

I'm not sure at this point what to look at next. This happened overnight, not gradually over time, and apart from running rough the engine isn't making any noises which based on sound, and how fast it happened doesn't make me think its a scoring/compression issue.

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Ford F-150 - 1997-2003 :: 1999 - Way To Access Cylinder 4

1999 f250 ld, 5.4.

Started running rough, checked codes. Initially got po300, po304. Reset, and when I checked again, had po171.

Checked the PCV lines, and found a split right near the throttle body. Of course. broke the plastic tube trying to pull it off. Replaced the short piece of hose with a longer piece to make up for the broken plastic tube.

Now, po171 is gone, but the others remain.

Cylinder # 4 looks impossible to get to. I would like to swap COPs to see if the code moves.

A. does this make sense?
B. how the hell to I get back there?

At a minimum, it looks like I have to disconnect a bunch of hoses, and maybe even remove the fuel rail.

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Ford F-150 - 1997-2003 :: 1998 4.2 V6 - Low Compression Cylinder 2

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On my way home the check engine light turned on which turned into a blinking check engine light and I knew I had been taken by a person with a diagnostic computer who cleared the codes. He made a comment about it turning on before but his "buddy" fixed the issue but I took his word because he seemed like a decent person.

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Now this mechanic runs more of a brake and exhaust shop so his next statements are why I'm coming to all of you for your opinions.

He said the cylinder was shot and everything inside was shot including the piston, rings, and everything else associated with #2. (I don't think he got in there to really check it out) After scouring the forums I hear more people talk about the valves may not be sealing correctly and what sound to me, to be smaller issues than the entire #2 cylinder being toast.

I'm not sure if I am going to go after the person who sold it to me or not yet but I would like to see what others may think is going on before I light this guy up. I plan on taking it to a more proficient mechanic to do the work, if deemed worthy of work, but would like to kmow where I stand.

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