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09escape Posted on May 03, 2014
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Vapor lock overcoming on cold injector engine

After I dropped cranking prematurely 3 times it cranks but does not start. There is I presume a paddle of a gas in every cylinder. After a while I recharged the buttery, geve couple more long crankings and EPC light came ON with a beep. We used to remove spark plugs and crank to ventilate gas out of cylinders in old carburetor cars. I guess this won't work with injectors. How to overcome the problem?

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Daryl Gleaton

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  • Master 749 Answers
  • Posted on May 03, 2014
Daryl Gleaton
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Remove the fuel pump relay then crank engine over 9 or 10 revolutions. Then replace fuel relay and try starting. Hope this helps, please post solved on fixya.com. So I get credit for a solved problem if it does. If not, check back and give me more info. P.S. The fuel pressure regulator and or spider lines to injectors may be leaking if it is flooding out on you.

  • 09escape
    09escape May 03, 2014

    Opps, it happen with 04 Jetta 2.0L. I tried cranking with removed Fuel pump fuse. Without the fuse after 2-3 seconds of cranking it gives a single combustion in one of cylinders. I repeated it 3 times, installed the fuse but it gives either similar short time push or starter stops on about 10th cranckshaft turn (like premature ignition happen) but resumes afterwards and just cranks it smoothly

  • 09escape
    09escape May 05, 2014

    Daryl, I do not see a button "solved" to push. I mark it as "useful and maybe see the "solved" when I unfollow. I'll use in future. The real problem was, while I was cranking cold engine, My timing belt lost about 10 teeth and the the timing has shifted. Luckily valves were not bent. Best Regards!

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So tell me does a vapour lock ,comes from a hole in the muffler,and would that make a cranking sound come from your engine

To promote easy starting, all gasolines contain volatile constituents that under some conditions, such as high ambient temperature, tend to produce more vapor than the fuel-system vents can handle. The action of an engine-mounted fuel pump, in decreasing the pressure at its inlet, tends to vaporize the fuel. If the vapor forms faster than the pump can draw it from the fuel line, the flow of fuel to a carburetor is effectively stopped and the engine stalls. Vapor lock is much less likely on a fuel-injected engine with an electric pump in the fuel tank. However, an engine with port fuel injection may experience vapor lock if the injector or fuel overheats, or if the Reid vapor pressure of the fuel is too high.

Read more: http://www.answers.com/topic/vapor-lock-1#ixzz2Pf13O7aL
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This can be fuel pump related or just fuel filter related, spark plugs and injectors.
When engine is cold vaporization of gasoline is minimum. When fuel vapor is less than required and the fuel mixture is not ideal, ignition happens harder than it does under ideal running conditions of engine. When fuel pups is sweak, or filter is limiting, or fuel injectors are not injecting gasoline with improper pattern inside engine, or just becasue of corroded spark plugs, cold engine faces difficulties during first ignition.

PS: sometimes car starts and stalls.it fails to start once more. this can be a sign of broken crank position sensor. FYI.
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You should also have a starter draw test and battery load test done. When the engine is hot, the compression is at its highest in the cylinders. This means the starter and battery will have the most resistance to overcome. The starter may be weak and the draw test will verify that.

In some ways, this sounds like a vapor lock problem. If the testing does not find anything for the above items, there are a few solenoids on the pollution system used to recover gasoline vapors from the engine. Some of the onboard computers will monitor those solenoids and some do not.
You may have to just change the part recommended for your model and see if it helps.

I hope my solution is very helpful in fixing your problem.
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check the cold start injector, on the side of the plenem. there is also a cold start timing valve (next to the engine coolant temp sensor) under neath the plenem which sends the signals to the injector. I have this same problem and have checked the fuel pump, relay and ingintion. now looking at these next...Good luck
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