Question about 1990 Subaru Legacy

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Missing on passenger side of engine. Gas floods through and comes out exhaust. Replaced fuel pressure regulator.no change. Checked compression on all cylinders.120 - 190 psi. Dropped exhaust at engine,no change. While running,I disconnected both fuel injectors on passenger side and no change. Misses real bad. Has a whitish-blue vapor- like exhaust cloud. Smells of gas. No antifreeze smell. Gas was found in oil and it was changed.

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  • kljarvis64 May 30, 2011

    Have already done all these things! Has new oil. Exhaust was disconnected at the manifold. Gas was coming out of the passenger side of engine exhaust. No restriction in exhaust. It has a dead miss on the number three cylinder. Has good fire on all plugs. Too much gas is flooding the passenger side of engine. Remember ,the fuel pressure regulator has been replaced. Did you carefully read my letter? You are quoting things I said I had already done! The number 4 injector has been replaced,too. It is hitting on the number 1 cylinder and 2&4,but not the back one,number 3.

  • kljarvis64 May 30, 2011

    Also want to add that I tried to get the engine light codes as stated in my repair manual,but the engine light just burns steady. No flashes to read. So the car's computer did not record any malfunctions.

  • kljarvis64 Jun 01, 2011

    Each of the cylinders were measured and on the first compression stroke they all measured out at 120 psi and then on the next stroke and each succeeding stroke up until about 5 they continued to reach right at 190 psi. I did what my repair Manual said to do. I removed the 4 spark plugs, then disconnected the fuel pump and the coil pack. Had a friend to turn over the engine and I monitored the gauge on each of the cylinders. They went from 120, 140,175 and then right at 190. No oil was added to the cylinders to see if more compression would result. This car had plenty of power and did not burn oil. It has 107,000 miles and was my folks car. It ran fine the day before and then it did this weird thing. It has been a well-maintained vehicle. Timing belt was replaced at 60,000 miles. It had so much oil that somehow seeped into the oil. I changed it and added STP as well. As stated before,the exhaust had been disconnected at the manifold to see if there was back pressure. It still ran the same. Kevin

  • kljarvis64 Jun 01, 2011

    I meant to say that gas had gotten into the oil and was reading half way up the dip stick!

  • kljarvis64 Jun 02, 2011

    Thanks, I will pick up one tomorrow at advance auto and will test in the evening. Will let you know the results. Kevin

  • kljarvis64 Jun 03, 2011

    Hello, I. Finally got a noid tester from auto zone,a rental tool! The ejector Calble for the number 3 and all other cylinders produced the flossing light. The engine was very difficult to start. It was so flooded with gas.it smoked a bluish gas cloud! Occasionally,it will pop in the exhaust,while missing on the number 3 cylinder. Now what? A friend suggests that there may be a defective injector,putting too much gas through. Should the fuel pump pressure be tested? Your suggestions I hope will help solve this mystery. kevin

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  • Master
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That is too wide of a gap between cylinder compression readings. 190 psi is great and 120 is worn but workable. What were all of the numbers and which cylinders?

Posted on May 30, 2011

  • Kori Policy
    Kori Policy Jun 02, 2011

    OK, I gotcha. The thing the manual was telling you to do was to see what the first "bang" would be indicating ring wear. 190 psi is outstanding. The next thing to check is the pulse at the injector with a noid light. This is a simple circuit tester that plugs into the harness where the injector would go. Once that is plugged in, crank the engine and see if the light goes on and off. If it fails to do this, the "drivers" inside the PCM are damaged and you will need to replace the PCM/ECU. Let me know what this test reveals. The noid lights can be purchased at most auto parts stores and don't run any more than $10.

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  • Subaru Master
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Its possible that your crankcase is full of gass too, I suggest change oil and filter, also, if it wont go over 40, the converter (catalytic) is probably damaged as well, raw fuel in the exhaust will break up the cat. Oil change is imperitive as too much liquid in the crankcase will destroy an engine in seconds. Can also be caused by the clogged converter, too much backpressure.

Get a vacuum gauge, hook into a manifold vacuum source. Increase RPM to 1500-200 and hold steady, if vacuum gauge falls, exhaust sytem has a restriction, the cat or muffler or a pipe has a broken chunk of the cat blocking it.

Hope helps; keep us updated.

Posted on May 29, 2011

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