right.. have this posted on another forum also so this will be a bit of a cut & paste but this is really starting to annoy me given the amount of time/effort/money i have put into the car.
first of all.. does the M20 have a cold start valve?
ok heres the problem.. sometimes it will start ok, other times it just doesnt want to start point blank.. only seems to happen when its cold. evne when it does start ok it will turn on the key for a few seconds before the engine
kicks into life. when its acting up it will turn on the key and the engine will kick once but not fire up, it will do this untill the battery runs flat. usually by this stage i put jump leads on it or plug the battery in on a fast charge for 5 mins and try again and it usually fires up after a few tries and then runs a bit lumpy for the first 5-10 seconds then back to normal. only happens when the car has sat over 13 hours in the cold but doesnt happen every time.
the only things i havent already replaced for other reasons is the AFM, ICV, fuel filter and the brown top coolant temp sensor. prettymuch everything else has been replaced, plugs, leads, distributor, fuel pump, FPR was changed but both the old and new to me one work fine.
i was thinking it may be the injectors seeping fuel and essentially flooding the engine as when i bought it one of the things wrong with it was the intake manifold gasket was toast on a couple cylinders, possibly from fuel saturating the gasket over time? cant really think of much else unless there is a cold start valve or something i missed..
i have also tried various chips including standard, its not chip/tune related.
ok heres the problem.. sometimes it will start ok, other times it just doesnt want to start point blank.. only seems to happen when its cold. evne when it does start ok it will turn on the key for a few seconds before the engine
kicks into life. when its acting up it will turn on the key and the engine will kick once but not fire up, it will do this untill the battery runs flat. usually by this stage i put jump leads on it or plug the battery in on a fast charge for 5 mins and try again and it usually fires up after a few tries and then runs a bit lumpy for the first 5-10 seconds then back to normal. only happens when the car has sat over 13 hours in the cold but doesnt happen every time.
the only things i havent already replaced for other reasons is the AFM, ICV, fuel filter and the brown top coolant temp sensor. prettymuch everything else has been replaced, plugs, leads, distributor, fuel pump, FPR was changed but both the old and new to me one work fine.
i was thinking it may be the injectors seeping fuel and essentially flooding the engine as when i bought it one of the things wrong with it was the intake manifold gasket was toast on a couple cylinders, possibly from fuel saturating the gasket over time? cant really think of much else unless there is a cold start valve or something i missed..
i have also tried various chips including standard, its not chip/tune related.
also FWIW i have tried starting it with the battery on a charger and also with the battery on said charger set for 12v engine start which will crank it plenty but it just doesnt fire. it will kick and stumble but just doesnt want to fire.. even today when i finally got it started it wanted to die so i had to give it some gas for the first 10-20 secs, runs very lumpy when its doing that also. last but not least i have even tried using some of that easy start type aerosol that u spray into the intake but again no effect.
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