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K-Jet Turbo fueling issue 200

posted by  someone claiming to be sdewolfe on  Sun Mar 30 01:07 CST 2008 [RELATED]

Howdy all,

Well, my $500 '82 245GLT is surpassing my expectations in several areas. The car hunted at idle, especially when cold, when I got it. Now it overshoots once at startup and settles in at an indicated 950RPM. It may surge once or twice during warmup; after that it is smooth. I reckon the idle motor may have been a bit lazy from sitting. Is that a plausible guess?

A set of plugs and wires cured the heavy misfire under boost. It will spool right up and keeps gaining speed well beyond what I need it to do. What this car needed most was to be driven. It hasn't used a drop of oil. I wish I could say the same for the transmission fluid. ;-)

After 700 miles of mostly highway travel I can report 28MPG(!) by the odometer. How accurate? Well, the speedometer reads about 10% high. But the route I normally follow that reads 178 miles on the Amazon (dead-on accurate, BTW; checked by GPS) yields 171 miles on this odo'. So, that MPG figure should be pretty darned close. I will check it with GPS on the way home.

The reason for the post: a strong odor of fuel when the turbo spools. The more pressure, the more pronounced the fuel odor. I have followed the fuel system from the tank to the injectors and I cannot find any evidence of a fuel leak. Gasoline is a mighty fine solvent; I should be able to find it.

Anyone got a clue for me?

sd








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    K-Jet Turbo fueling issue 200

    posted by  pageda on  Sun Mar 30 04:11 CST 2008
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    last visit: Fri Oct 24 13:18 CST 2014
    [RELATED]

    Take the idle air control valve off and clean the moving parts with carb cleaner. Dan








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      K-Jet Turbo fueling issue 200

      posted by  someone claiming to be sdewolfe on  Sun Mar 30 06:33 CST 2008 [RELATED]

      Howdy Dan,

      I will get to that idle air motor one day this coming week.

      Actually I am more concerned about the fuel smell under heavy load (boost). It really bothers me that I cannot locate any trace of where the gasoline is escaping.

      sd








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        K-Jet Turbo fueling issue 200

        uid 18083's pic
        posted by  lucid on  Sun Mar 30 07:21 CST 2008
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        last visit: Fri Oct 24 12:31 CST 2014
        [RELATED]

        I think that slight idle variation from cold is normal, as the ECU transitions from a fixed*, cool-running mixture to one based on the O2 sensor signal.

        *there is a block sensor/switch that's closed till 65°, grounding an ECU pin that sets the richer "dwell" on the Frequency Valve (fine trim on mixture).

        As to the fuel smell, I wonder about the Accumulator under the car. Sometimes the diaphragm can leak, with the fuel exiting from a hole in the back. Some accumulators even have a hose from the hole back to a separate return pipe on the tank unit (safety I guess). Other accumulators have no exit holes, except for rust-thru.

        A small under-car leak could be blown dry fairly fast, yet leave an odor that would seem to come from everywhere.
        --
        Bruce Young
        '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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          K-Jet Turbo fueling issue 200

          posted by  someone claiming to be sdewolfe on  Sun Mar 30 08:56 CST 2008 [RELATED]

          Bruce,

          I will pay particular attention to the accumulator when I get a chance to get under the car again. I don't think the accumulator would be the problem though; it stays at system pressure so I would expect to smell fuel all the time if it leaks. The only time I smell fuel is under heavy load. The smell gets worse as RPM builds. That leads me to think the leak is associated with things downstream of the distributor.

          sd








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            K-Jet Turbo fueling issue 200

            uid 18083's pic
            posted by  lucid on  Sun Mar 30 10:51 CST 2008
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            last visit: Fri Oct 24 12:31 CST 2014
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            "That leads me to think the leak is associated with things downstream of the distributor."

            Off hand the only thing I can think of that's downstream of the FD is the injectors. But then there is also the the Frequency Valve right there "passing gas". And I had one that leaked gas once, due to a wiring harness mistake.

            I don't know for sure about the turbo but on the plain K-jet, the plugs for the Frequency Valve (FV) can be switched with the Control Pressure (aka Warm Up) Regulator. That puts constant rather than a pulsing voltage on the FV, which as I recall (14 years now) caused rich running and finally actual leaking at the FV body.

            Just to be sure, the wires at the FV should be a brown and a green. You might also find it damp on the outside right after running, if it's in the early stages.
            --
            Bruce Young
            '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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              K-Jet Turbo fueling issue 200

              posted by  someone claiming to be sdewolfe on  Sun Mar 30 11:33 CST 2008 [RELATED]

              Thank-you! Now, I've got something to check into. The man said he replaced the engine harness...







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        K-Jet Turbo fueling issue 200

        posted by  pageda on  Sun Mar 30 07:14 CST 2008
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        last visit: Fri Oct 24 13:18 CST 2014
        [RELATED]

        Not having any tubo experiece I passed on that problem, but if you have a fuel pressure regulator check the vac line for gas odor. Dan







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