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Discussion Starter · #1 ·
misfire on decelleration on 1998 5 speed. no check engine light. misfire only shown in mode 6. new coil, wires, plugs, maf, and fuel filter. also swapped out injectors and issue is still present. thanks in advance. dan
 

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Does it only do it at low rpm (1200 or lower), or only when you finally put your foot back on the gas pedal?

I have a 2nd gen. Escort LX with the 5 speed. I connected a pair of wires at one of the fuel injector connectors, so I could have an l.e.d. and resistor inside the car and visible to me as I drove; the l.e.d. flashes each time the injector fires. On deceleration the injectors dont fire at all if the engine rpm is about about 1100 or 1200 rpm. If I push on the gas -at all-, the injectors would come back on. So a bad TPS might cause the injectors to fire on deceleration, and that might result in "afterfiring", i.e. a 'pop' out of the exhasut system.
 

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The ECU turns the fuel off during deceleration (foot off the gas) if the car is moving less than 15 MPH and if the temperature is more than 120 degrees.

It has nothing to do with RPM and it is normal. The idea is fuel economy.
 

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I hope you mean moving -faster- than 15 mph.

Anyway, my 94 2nd gen. LX Escort seems to be a little different. I tried the decelleration check in all gears except 1st, and the injectors coming back into use always happened between 1100 and 1200 rpm (on my aftermarket tach installation), though of course at the different highway speeds per each gear.
The engine was fully warm.
 

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Discussion Starter · #6 ·
yanked out the o2. all corroded replaced sensor but am still having the same issue. did notice a increase in power. sorry that i didnt really explain in detail when it happens. on decel at any speed i feel a surge and occassionally on accel between 2500 and 3500 rpm a hesitation. i've put atleast 50k on car with problem. just seems to act up more often lately. like said above has no codes but does show misfire on mode 6 on IDS. thanks again. dan
 

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Discussion Starter · #7 ·
update: found slight internal head gasket leak. will be yanking the cyl head off some time next week. will plain the head down at work, install new head gasket and head bolts. then see how the champ runs after the work.
 
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