I have an intermittant missfire. I was driving down an a-road the other day and it started missfiring really bad so I pulled over and had a look. All relevant plugs connected. Drove through a 30mph village and out the other side. Still doing it after a good caning. Drove through a 40mph village and it cleared. After a couple of weeks it came back yesterday.

 

Driving along a-roads and after about 5 miles it was missfiring for about 15 miles then mysteriously dissappeared. Have cleaned out injector and plug cap connectors about 2 weeks ago. Not cleaned tps connector but checked CAS and PTU connectors which seem fine. Temp switch connector seems dodgy and not cleaned out throttle bodies yet.

 

Any ideas people.

 

Ivan :confused: :confused: :confused: :confused:

check the coil pack connectors are pushed down all the way, one of mine was slightly lifted and caused a missfire.

 

Vijat

I had an intermittant misfire that developed just after i bought my car...then dissapeared....then reappeared. I did the usual checks like PTU connector, plugs, coil connectors , injector connectors etc..all appeared fine after cleaning corrosion off injector terminals ( i have had my car a year and a half).

The misfire soon vanished and all was oki until oct last year when my car cut out when it was warm and wouldnt restart.....then it started.....3 times this happened going home from work...i even had the car running when i was messing around with it...left it for 10 mins and it wouldnt restart.......then checking injector wiring/plugs etc..still no start..i left the car for 2 days...turned the key and she burst into life.

 

I bought a PTU from courtesy in usa....al been oki now since chrimbo apart from dodgy tickover when cold and hot which i suspect is my coolant sensor.

I suspect the PTU failed due to me working locally and having many start/stops during the day as I go everywhere in my zed.

HTH John Crisp

I had a strange misfire as well. Usually just after flooring it. One time I was going down the motorway and if I held the throttle at a certain position it would misfire. Put a little more throttle on and it was fine.

I never found out what it was, but I think it could have been heat soak into the loom as it was a very hot day and the engine was hot too.

Thanks guy's. I'll have a look at all the connections again and clean out the throttle bodies and see what happens.

 

Ivan

Just had a thought guys. The car has nearly always miss-fired on tick-over but normally as soon as you put your foot on the gas it perks up immediatly. Wondered if this has anything to do with it. It had a second hand PTU fitted in September 2002. Hope it isn't this :(

 

Ivan