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2001 PS190 LTR330 Running BAD!

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  • Engine Nut
    replied
    Originally posted by jmac197
    $1.99

    my manual states that the '02 LTR requires the MR43LTST. Note the extra T on the end of the part number. What does that extra T stand for? Can I use the MR43LTS?

    The NAPA guy looked in the front of the book and thought that it meant that the plug was for a tapered seat. Make sense?

    Thanks
    Jim
    That extra T at the end of the number must be an error. I checked the MR43LTS plugs in out stock and they have tapered seats. They are the correct plugs for all LT1's and 5.7's with Vortec Heads.

    Engine Nut

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  • OhioProstar
    replied
    Message Engine Nut and he can let you know if your engine can run the LTS plugs.

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  • JimN
    replied
    I don't remember the tapered seat, but I believe the last T is referring to that. Call MC to verify this.

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  • jmac197
    replied
    $1.99

    my manual states that the '02 LTR requires the MR43LTST. Note the extra T on the end of the part number. What does that extra T stand for? Can I use the MR43LTS?

    The NAPA guy looked in the front of the book and thought that it meant that the plug was for a tapered seat. Make sense?

    Thanks
    Jim

    Leave a comment:


  • JimN
    replied
    How much are they? If they cost much more than $2.25, they're charging too much.

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  • jmac197
    replied
    I just called NAPA and they have them in stock.....my bad or my bad timing not sure. Thanks JimN....

    Sorry all for the threadjack.....

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  • JimN
    replied
    NAPA can get them and any other place that sells AC plugs can, too. I just called a local parts dealer and the warehouse has them in stock.

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  • jmac197
    replied
    Originally posted by JimN
    ...... How old are the spark plugs? Make sure you have AC MR43LTS plugs in it. Also, you're due for plug wires. They should do a compression test, too.
    JimN

    I've been looking for these plugs all over, to no avail. Where are they found? I went to NAPA and all the standard autoparts places. They wanted to sell me their non-marine equivalent.

    Thanks
    Jim

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  • JimN
    replied
    The plugs need to be checked to see which are not firing. If you see water on any of them, it could be from a variety of causes but don't worry about it until you see it. If the plugs are black and sooty, clean them and run it to see if it clears up. It could just be a bit of water getting into the fuel line(highly unlikely since the fuel pump filter won't pass molecules larger than 5 microns), or the coolant temperature sensor/harness could be bad. If the ECM sees an open sensor or a really low temperature from it, it increases the amount of fuel delivered.

    You need to take a gas sample and check the fuel pressure. If you have a clogged fuel filter, you won't go fast. How old are the spark plugs? Make sure you have AC MR43LTS plugs in it. Also, you're due for plug wires. They should do a compression test, too.

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  • agua4fun
    replied
    Thanks for all of the help guys, I called my local shop (1 hour away) ,they think that i am having multiple problems at once, and said they could get me in in just a few days. Usually they are weeks behind so im going to take them up on it.

    Sounds like you may have found your problem bucky. Hopefully mine is just as simple.

    thanks for the quick replies
    Dave Z

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  • bucky
    replied
    Just pulled the silver thingy. turns out it's kind of fake distributor shaft. It has a gear at the bottom that is turned by the cam, which in turn turns the oil pump shaft. All steel or bronze, no visible damage.
    When I was removing it, I noticed some red markings on the top. Putting it back, I rotated it and realized it was an "R" that someone had written on it. I assume it stands for "Recall".
    Also, beneath and behind it was a bolt with several ground wires attached to the block. Barely. I tightend this nut, changed oil and filter, and fired her up on the hose. The oil pressure guage held steady. Will do more watching on the lake this week, one of the benefits of shift work being that we work 3 weeks (14 twelve hour days spread out) then have a week off starting 18:00 today. See y'all in a week and thanks for the help!

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  • bucky
    replied
    Excellent. I'll check tonight. Gonna buy a new thermostat as a critical spare, also.



    Originally posted by TrevorA
    Bucky, You're right no distributor, but there is still a for a lack of the correct techincal term a round metal thing in place of the Dist cap. It's a little larger than a silver dollar, and about 3 times as thick. Located on the top center rear portion of the engine. Sorry I'm not a mechanic. Grab a wrench or something to pull it off. You'll see the gear I'm talking about at the end of the "distributorless" thingy...

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  • TrevorA
    replied
    Bucky, You're right no distributor, but there is still a for a lack of the correct techincal term a round metal thing in place of the Dist cap. It's a little larger than a silver dollar, and about 3 times as thick. Located on the top center rear portion of the engine. Sorry I'm not a mechanic. Grab a wrench or something to pull it off. You'll see the gear I'm talking about at the end of the "distributorless" thingy...

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  • bucky
    replied
    I have the same- '01 ps190/LTR. my oil pressure guage drops at idle, also, but has done so for 3 mo. with no effect No ticking sound. I thought it was a bad ground at the dash, since pp is messing up also. I better check the oil pump drive. Any advice on finding/ checking?

    Edit- The LTR 330 has no distributor. It has the Cadillac Northstar direct ignition.

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  • Storm861triple
    replied
    What Trevor said. Pull the dist. and look at the gear. It's easy to do and costs nothing.

    Running at a lower temp won't cause the engine to "choke out". It needs more fuel at a colder temp so it gets more fuel. That doesn't choke it out. I do think the operating temps are low, and i'd change the T-stat for that, but I don't think that is causing or related to you symptoms.

    Pull the dist. and maybe the plugs and report back here for the next step.

    -Tom

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