'99 constant misfire
#1
'99 constant misfire
Hey guys I'm looking at a 99 bone stock 140k civic for a friend. I'm a turf equipment mechanic but work on the side here and there. He says last friday in the rain his MIL lamp began flashing and running rough. I looked at it yesterday(monday) and it coded for:p0304,p0302,p0141,p1399,p0301 runs rough at idle and throttle.I began by replacing the 02 sensor which did not help then installed 4 new denso plugs which did not help either. The last thing I was able to do because of time was check compression. 150 all across. Also I put a spark tester on all four wires and they all spark. Car isnt hard to start.
Because I only have a chance to look at the car in spurts because it's not mine, what insight would you guys offer to look at next? Stock timing belt so could it be a tooth off?
Because I only have a chance to look at the car in spurts because it's not mine, what insight would you guys offer to look at next? Stock timing belt so could it be a tooth off?
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Re: '99 constant misfire
I am having a similar issue on my 99 D16Y8. I had the CEL blink on me a few times now. It seems that every time I replace something it is fine for a week, then blink blink blink! So I pulled the codes and have only gotten P1399, that's it.
Replaced:
Plugs (3 time in 1000 miles)
Cap
Rotor
Wires
Check/Adjust:
Valves adjusted
injectors pulled and cleaned
TPS sensor re-calibrated
Timing done over (remove belt and start from scratch)
Timed to 12deg +/- 1deg
Sprayed carb clean around looking for vacc. leaks...None
Coil ohmed out fine
Dizzy is newer
It did it the first time after I put QFC reg in it. I usually run Shell. Andits beem doing it off and on for 2 weeks or so.
I really need some help im on an extremely tight budget. Any Help appreciated!
Replaced:
Plugs (3 time in 1000 miles)
Cap
Rotor
Wires
Check/Adjust:
Valves adjusted
injectors pulled and cleaned
TPS sensor re-calibrated
Timing done over (remove belt and start from scratch)
Timed to 12deg +/- 1deg
Sprayed carb clean around looking for vacc. leaks...None
Coil ohmed out fine
Dizzy is newer
It did it the first time after I put QFC reg in it. I usually run Shell. Andits beem doing it off and on for 2 weeks or so.
I really need some help im on an extremely tight budget. Any Help appreciated!
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