Car at hand is 1999 escort zx2
Past week or so seems like every other morning when I fire car up it'll run lil rough while cold, but at same time I'm hearing hollow popping noise coming from intake tube. If I tap gas it clears up and runs smooth.
No CEL coming on, all ignition components are fairly new if that matters.
Could this be something internal possibly. Or old POS and should I just ignore it?
Weak valve spring or recessed valve seat on an intake valve?
Did that hundred shot of nitrous blow the welds on it?
Popping sound in the intake is combustion coming back up an intake valve, generally.
In reply to Streetwiseguy :
I've thought about that but it only happens at first on cold idle. I can idle it for 15 seconds, drive 20 feet and never happens again.
In reply to superfund :
100 shot would blow more then welds on this heap of jankness
Stickie valve guide. once it gets oil and heat free's up a bit.
Lean condition
So way back, I had heard that these engines had a stalling issue that was related to the intake valves growing quickly, and the lash system not being able to cope with it. Used to cause cold stalls.
I'd guess it would be that.
I've heard this engine is notorious for having a rough idle but not the valves growing. Wouldn't surprise me though with amount of miles I have on it and being old Ford.
Im try swap back in stock ECU see if that does anything different if it is leaning out.
We had a 4 liter Ford V6 in a while ago that had cold misfires due to worn seats. As things heated up and gre/shrunk/whatever, it opened enough to allow the valve to close. It had used up all the lash adjuster depth. Depending on how hard it is to get the valve cover off, you might be able to see if one lash adjuster is compressed more than the others.
Subscriber-unavailabile said:I've heard this engine is notorious for having a rough idle but not the valves growing. Wouldn't surprise me though with amount of miles I have on it and being old Ford.
Im try swap back in stock ECU see if that does anything different if it is leaning out.
We called it start-run-stall, and it caused quite a panic, even after someone figued our what it was.
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