[DeTomaso] Unhappy motor - looking for suggestions
Will Kooiman
will.kooiman at gmail.com
Mon Nov 3 16:04:08 EST 2014
It could be a lot of things, but I would put money on a plugged fuel
filter.
They are cheap, and it's probably time to change it anyway.
--
Will
On 11/3/14 10:09 AM, "michael at michaelshortt.com"
<michael at michaelshortt.com> wrote:
> Water in the dist cap sounds more likely.
>
> Michael
>
> On Nov 3, 2014 8:48 AM, "Charles McCall" <[1]charlesmccall at gmail.com>
> wrote:
>
> A A Thanks Jeff. It isn't unusually humid here and the car is
> always stored
> A A indoors. As I was writing this, however, it occured to me that
> it isn't
> A A imposible that some wA!ter may have entered the air cleaner and
> dropped
> A A into the carb while washing the car. I'm usually pretty careful
> with
> A A where I aim the hose, but I couldn't swear that the engine
> stayed dry,
> A A or when opening the decklid when wet, some wA!ter may have run
> off near
> A A the cleaner...
> A A A
> A A I will take the air cleaner off and see if I see a healthy
> squirt from
> A A the acclerator pump. I don't think it would be fuel pump or
> clogged
> A A fuel filter, as it stumbles under trailing throttle as well, it
> it can
> A A provide enough fuel for sustainted 115mph running
> A A A
> A A Could it be electrical? My last MSD 6AL gave some really weird
> symptoms
> A A that I thought were carb-related before I changed the box and
> all my
> A A problems went away. I'll go step-by-step
> A A On Mon, Nov 3, 2014 at 12:55 AM, <[1][2]jgkrenton at comcast.net>
> wrote:
> A A Charlie:
> A A How's the weather??
> A A Your problem sort of sounds like it could be water in the fuel
> to me.A
> A A Just a drop can be a problem and once you get it in there, it
> can hang
> A A around a long time.A
> A A As already mentioned, do the usual things to make sure you
> didn't
> A A "introduce" the problem during the recent tuning.AA Take the
> air
> A A cleaner off and see if that makes any difference.AA Check the
> timing
> A A (yes, a pain on the Pantera). Make sure the accelerator pump is
> A A squirting. Check the fuel pressure/fuel pump etc.AA I have
> also been
> A A recently bit by a bad coil and a bad fuel pump.AA Don't rule
> anything
> A A out.
> A A Then dump some "fuel dryer" in the tank and run it a bit to see
> if that
> A A helps.AA Here in Seattle, water in the fuel is a common
> problem.
> A A The fuel dryer should help, but there is also the tried and
> true "rag
> A A tune".
> A A You have to be careful with this one, but the idea is to rev
> the engine
> A A a bit by hand with the air cleaner off.A AA Then when the
> engine is
> A A reving a bit, maybe 2500 RPM, shove a big rag over the carb for
> just a
> A A second. (The air-horns, choke, secondary venturies will keep
> the rag
> A A from being sucked into the engine). The rag acts like a massive
> choke
> A A and the engine will smoke and die if you leave the rag there
> for more
> A A than a few seconds.AA But what this does is raise the full
> engine
> A A vacuum up above the throttle plates and jets/ bleeds to the
> A A air-horn/rag level.AA This "extra" vacuum will draw any water
> out of
> A A the jets/bleeds where the "normal" vacuum often is not strong
> enough to
> A A pull any water out of the jets.
> A A If your carb is a Holley, you can pull the float chambers off
> too and
> A A make sure they don't have water in them....
> A A Good luck.
> A A Jeff/2467
> A A
> A __________________________________________________________________
> A A From: "McCall, Charles" <[2][3]charlesmccall at gmail.com>
> A A To: "Mark Charlton" <[3][4]pantera01826 at rogers.com>
> A A Cc: "DeTomaso Mail List" <[4][5]detomaso at poca.com>
> A A Sent: Sunday, November 2, 2014 11:46:48 AM
> A A Subject: Re: [DeTomaso] Unhappy motor - looking for suggestions
> A A Thanks Mark, but I used 3 full tanks of gas in the past 2 days
> :-o
> A A The problem has gotten slowly worse, I think.
> A A -----Original Message-----
> A A From: Mark Charlton [mailto:[5][6]pantera01826 at rogers.com]
> A A Sent: domingo, 2 de noviembre de 2014 20:43
> A A To: Charles McCall
> A A Cc: DeTomaso Mail List
> A A Subject: Re: [DeTomaso] Unhappy motor - looking for suggestions
> A A Charlie,
> A A I had a very similar experience with my car during a long tour
> in
> A A western
> A A Canada. We checked everything and concluded it must be a carb
> issue.
> A A After a
> A A full tear-down of the carb revealed nothing wrong at all, I
> filled the
> A A car
> A A (it was 3/4 empty) and the car ran fine again. We concluded
> that a
> A A stale
> A A batch of 94 octane gas (not commonly available) caused the
> issue. With
> A A any
> A A luck that will be your case too I hope.
> A A Mark Charlton
> A A [6][7]pantera01826 at rogers.com
> A A On Nov 2, 2014, at 2:20 PM, Charles McCall
> <[7][8]charlesmccall at gmail.com>
> A A wrote:
> A A > I haven't checked timing, but wouldn't that make the engine
> run hot?
> A A >
> A A > Would that explain the stumble? It might explain why it
> doesn't feel
> A A as
> A A > crisp as it should
> A A >
> A A > -----Original Message-----
> A A > From: thomas [mailto:[8][9]thomas at hax.se]
> A A > Sent: domingo, 2 de noviembre de 2014 20:18
> A A > To: Charles McCall
> A A > Cc: <[9][10]detomaso at poca.com>
> A A > Subject: Re: [DeTomaso] Unhappy motor - looking for
> suggestions
> A A >
> A A > The distributor gear pin?
> A A >
> A A > Checked timing?
> A A >
> A A >
> A A >> 2 nov 2014 kl. 20:13 skrev Charles McCall
> A A <[10][11]charlesmccall at gmail.com>:
> A A >>
> A A >> A Hi all
> A A >>
> A A >>
> A A >> A I just got back from a Supercar event in northern Spain
> with 35
> A A cars
> A A >> A attending - Lambo, Ferrari, Viper, Porsche, and, as usual,
> a lone
> A A >> A DeTomaso!
> A A >>
> A A >>
> A A >> A The highlight for me without a doubt was an 8-minute burst
> on the
> A A >> A highway with the police clearing the way for us, cruising
> at a
> A A steady
> A A >> A GPS-indicated 180 k/hr in a 35 car convoy... the people
> out for a
> A A >> A Sunday drive must have had their minds boggled...
> A A >>
> A A >>
> A A >> A Anyway, my engine is not happy. This morning in the hotel
> parking
> A A lot I
> A A >> A really thought that we'd have to skip today's event
> because it
> A A wouldn't
> A A >> A start and didn't sound like it was even thinking about
> starting.
> A A Took
> A A >> A probably 5 minutes of crank-wait-crank-wait before it
> fired.
> A A Yesterday
> A A >> A at the gas station it took 2-3 minutes to start, something
> that
> A A has
> A A >> A never, ever happened before. It is really hard to describe
> the
> A A problem
> A A >> A so much of it is "feel", but I'll do my best.
> A A >>
> A A >>
> A A >> A A few weeks ago I noticed that the engine would tend to
> stumble if
> A A I
> A A >> A would floor the throttle, then clear its throat and pull.
> For
> A A example,
> A A >> A I like to heel-and-toe, just because, and when blipping
> the
> A A throttle it
> A A >> A would stumble instead of rev. The engine also felt a
> little
> A A rougher, as
> A A >> A though it vibrated more than I remembered it. I don't
> remember if
> A A this
> A A >> A was before or after I did a short tune-up, by adjusting
> the valve
> A A lash
> A A >> A (I have mechanical lifters), and cleaning the K&N air
> filter by
> A A >> A applying K&N filter oil, etc. or if it is irrelevant. So I
> was
> A A messing
> A A >> A around in the engine bay recently...
> A A >>
> A A >>
> A A >> A This weekend the engine felt considerably worse. It felt
> like it
> A A would
> A A >> A stumble under partial throttle as well. It would stumble a
> little
> A A bit
> A A >> A under trailing throttle going downhill as well, so I don't
> think
> A A it is
> A A >> A a clogged fuel filter.
> A A >>
> A A >>
> A A >> A Oil temp is perfect. Oil pressure is perfect. Water temp
> is
> A A perfect.
> A A >> A The engine idles perfectly. But if you floor the gas from
> idle,
> A A it'll
> A A >> A stall. The engine doesn't feel crisp, it feels bloated and
> soft,
> A A if
> A A >> A that makes sense. It feels rough, and it feels like it
> A A occasionally
> A A >> A stumbles under constant throttle at highway speed. It
> pulls hard
> A A when
> A A >> A accelerating, but I don't think as hard as it used to, or
> as high
> A A (I
> A A >> A have a 6500 rpm limiting chip in the MSD that it used to
> pull very
> A A >> A easily to).
> A A >>
> A A >>
> A A >> A Suggestions for where to begin looking? And other info
> that would
> A A help
> A A >> A in troubleshooting?
> A A >>
> A A >>
> A A >> !DSPAM:54568258260291209923907!
> A A >> _______________________________________________
> A A >>
> A A >> Detomaso Forum Managed by POCA
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> A A >>
> A A >>
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> A A >
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> A A > Detomaso Forum Managed by POCA
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> References
> A A 1. mailto:[18]jgkrenton at comcast.net
> A A 2. mailto:[19]charlesmccall at gmail.com
> A A 3. mailto:[20]pantera01826 at rogers.com
> A A 4. mailto:[21]detomaso at poca.com
> A A 5. mailto:[22]pantera01826 at rogers.com
> A A 6. mailto:[23]pantera01826 at rogers.com
> A A 7. mailto:[24]charlesmccall at gmail.com
> A A 8. mailto:[25]thomas at hax.se
> A A 9. mailto:[26]detomaso at poca.com
> A 10. mailto:[27]charlesmccall at gmail.com
> A 11. mailto:[28]DeTomaso at poca.com
> A 12. [29]http://poca.com/mailman/listinfo/detomaso_poca.com
> A 13. mailto:[30]DeTomaso at poca.com
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> A 15. mailto:[32]DeTomaso at poca.com
> A 16. [33]http://poca.com/mailman/listinfo/detomaso_poca.com
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>References
>
> 1. mailto:charlesmccall at gmail.com
> 2. mailto:jgkrenton at comcast.net
> 3. mailto:charlesmccall at gmail.com
> 4. mailto:pantera01826 at rogers.com
> 5. mailto:detomaso at poca.com
> 6. mailto:pantera01826 at rogers.com
> 7. mailto:pantera01826 at rogers.com
> 8. mailto:charlesmccall at gmail.com
> 9. mailto:thomas at hax.se
> 10. mailto:detomaso at poca.com
> 11. mailto:charlesmccall at gmail.com
> 12. mailto:DeTomaso at poca.com
> 13. http://poca.com/mailman/listinfo/detomaso_poca.com
> 14. mailto:DeTomaso at poca.com
> 15. http://poca.com/mailman/listinfo/detomaso_poca.com
> 16. mailto:DeTomaso at poca.com
> 17. http://poca.com/mailman/listinfo/detomaso_poca.com
> 18. mailto:jgkrenton at comcast.net
> 19. mailto:charlesmccall at gmail.com
> 20. mailto:pantera01826 at rogers.com
> 21. mailto:detomaso at poca.com
> 22. mailto:pantera01826 at rogers.com
> 23. mailto:pantera01826 at rogers.com
> 24. mailto:charlesmccall at gmail.com
> 25. mailto:thomas at hax.se
> 26. mailto:detomaso at poca.com
> 27. mailto:charlesmccall at gmail.com
> 28. mailto:DeTomaso at poca.com
> 29. http://poca.com/mailman/listinfo/detomaso_poca.com
> 30. mailto:DeTomaso at poca.com
> 31. http://poca.com/mailman/listinfo/detomaso_poca.com
> 32. mailto:DeTomaso at poca.com
> 33. http://poca.com/mailman/listinfo/detomaso_poca.com
> 34. mailto:DeTomaso at poca.com
> 35. http://poca.com/mailman/listinfo/detomaso_poca.com
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