Engine start

[Coupe]

If i start my engine, it needs a little time to start up. and if the engine is cold, only then, the engine is cog a little, it feels as it´s running with only 5 cylinders!
what can it be?

[FordNut]

Possibly spark plugs or coils.

[SC Cheesehead]

I agree with FordNut, how many miles on the car? Also, have you recently cleaned the engine, got it wet under the hood?

[Coupe]

no, no wet! 120000km an new sparks

[UncleLar]

Double check you installed the COPs correctly.

[SC Cheesehead]

Double check you installed the COPs correctly.

+1, sounds like that may be your problem.

[Coupe]

what means cop?

[FordNut]

Coil On Plug.

I wonder if there is some fuel issue with your LPG conversion? If you can override the switchover and run it on gasoline only, then see if the missing occurs the next time you have a cold start that could be helpful data for troubleshooting.

[Coupe]

not good for the valves to start the engine with lpg! the COP´s are fits correctly!

[FordNut]

not good for the valves to start the engine with lpg!

That's not what I suggested. I said turn off the LPG altogether. Drive the car awhile on gas. Let it cool down or park it overnight, whenever the problem is noticeable. Start the car and see if it runs correctly or not.

[Coupe]

ah, kow now. what you mean! but pity, it´s the same!!!

[FordNut]

Maybe it has a bad coil (COP), not a bad connection?

[sd8683]

Try cleaning your MAF, its worth a shot, maybe a vacuum leak?

[FordNut]

Maybe, just maybe, it could be the valve seats. I'd go for the easy stuff first.

[Coupe]

Maybe it has a bad coil (COP), not a bad connection?
it´s, what i think! how can i find it out?

@sd8683: how ca i fid the MAF? a vacuum leak? where?

[252life]

it´s, what i think! how can i find it out?



To test the COP's, the easiest way is to measure the resistance (Ohm) , they should all have similar resistance.


And also if you want to clean the MAF (mass air flow sensor) just remove it from the air filter box / intake tube and spray on "electronic cleaner" be careful not to touch the sensor.


And you can check for vacuum leaks with the engine idling, spray on brake-cleaner or carburetor-cleaner on the place you think there might be a vacuum leak and if it is a leak the engine rpm's will increace.

Hope you find the problem, good luck!

[justbob]

Sounds like the IAC, pull it off and clean it. This was exactly what mine was doing over the winter.

[Coupe]

thank you, for the tips!
What means IAC? intake air ???

[252life]

thank you, for the tips!
What means IAC? intake air ???


Idle Air Control Valve

[frdwrnch]

There could be many root causes for this symptom. I agree with all of the previously mentioned items and I'll add one. If you have a fuel injector that is stuck open even partially, it will cause a long crank and it will run rough when it does fire because it has flooded one cylinder. Ck fuel pressure with a guage to see if it bleeds off rapidly when turning the car off. This may indicate an injector problem.

[Coupe]

Ck fuel pressure with a guage to see if it bleeds off rapidly when turning the car off.

What did you mean with that statement?
how can i check the valves?

[FordNut]

Check valves with a compression test and a leakdown test.

Actually the idea of a fuel injector makes sense too. When the car is turned off the fuel system should hold pressure due to the check valve in the tank. If an injector is leaking it would not hold pressure. I imagine the injectors would get at least some lubrication from gasoline which may not be present with LPG, so it could possibly increase wear.