Intermittent CEL 93 Festiva

[Kenkyona]

So i have my major problems sorted, but i still have a slight bucking if i am at around half throttle for longer then a few seconds and sometimes slight power loss at random times during acceleration.

I can deal with it, but i want this car to run perfect

Less then 100km on:
Wires
Plugs
Cap
Rotor
ECT
VAF
Fuel Filter
Fuel Pump
Pump Sock


TSRM suggests TPS or o2 sensor but i want to get your guys advice before i proceed

[David88]

Check for air leaks on your intake tube.

[Kenkyona]

Check for air leaks on your intake tube.

Done, no vac leaks, problem is intermittent not constant like a vac leak

[ricko1966]

I would test the o2 sensor and tips before replacing them.Leaks in an intake boot are not always constant, more often the boots get cracks that only open up at certain times like decel in gear or accelerating and are just fine sitting in the drive way idling.Try squeezing the boot in several places while idling and listen for Chang in idle.I have also seen wiring issues where a wire shorts only at highway speed with enough air to push the harness to ground or when the engine rocks on the motor mounts.

[TominMO]

^^ Good tips on subtle problems, ricko.

[helli]

Ignition coil breaking down or ignition control module can make those type symptoms.

[TominMO]

Also look at the inside of the coil, where the disty wire plugs in. It can get corroded in there, and you lose the good connection. It will be intermittent at random times, then fail completely when it gets sufficiently corroded.

[Kenkyona]

Ignition coil breaking down or ignition control module can make those type symptoms.

hmm, where is the ICM/ICU on the festiva? might pick some up from the local jy

Also look at the inside of the coil, where the disty wire plugs in. It can get corroded in there, and you lose the good connection. It will be intermittent at random times, then fail completely when it gets sufficiently corroded.

Clean as a whistle in there


So my CEL flashes and sometimes stays on when this happens, multiple times during a trip but doesn't store any codes? where is OBD1 when you need him, on vacation.