[DeTomaso] Unhappy motor - looking for suggestions

Pantdino pantdino at aol.com
Sun Nov 2 14:51:37 EST 2014


I don't think not seeing anything visibly wrong with a carb on teardown means it wasn't the problem. Carb jets are very specific and exact in size and having a bit of crud in one will affect fuel flow without being noticeable upon inspection.
 
 
 
 
-----Original Message-----
From: Charles McCall <charlesmccall at gmail.com>
To: 'Mark Charlton' <pantera01826 at rogers.com>
Cc: 'DeTomaso Mail List' <detomaso at poca.com>
Sent: Sun, Nov 2, 2014 11:47 am
Subject: Re: [DeTomaso] Unhappy motor - looking for suggestions


Thanks Mark, but I used 3 full tanks of gas in the past 2 days :-o 

The problem has gotten slowly worse, I think. 

-----Original Message-----
From: Mark Charlton [mailto:pantera01826 at rogers.com] 
Sent: domingo, 2 de noviembre de 2014 20:43
To: Charles McCall
Cc: DeTomaso Mail List
Subject: Re: [DeTomaso] Unhappy motor - looking for suggestions

Charlie,

I had a very similar experience with my car during a long tour in western
Canada. We checked everything and concluded it must be a carb issue. After a
full tear-down of the carb revealed nothing wrong at all, I filled the car
(it was 3/4 empty) and the car ran fine again. We concluded that a stale
batch of 94 octane gas (not commonly available) caused the issue. With any
luck that will be your case too I hope.

Mark Charlton
pantera01826 at rogers.com



On Nov 2, 2014, at 2:20 PM, Charles McCall <charlesmccall at gmail.com> wrote:

> I haven't checked timing, but wouldn't that make the engine run hot? 
> 
> Would that explain the stumble? It might explain why it doesn't feel as
> crisp as it should
> 
> -----Original Message-----
> From: thomas [mailto:thomas at hax.se] 
> Sent: domingo, 2 de noviembre de 2014 20:18
> To: Charles McCall
> Cc: <detomaso at poca.com>
> Subject: Re: [DeTomaso] Unhappy motor - looking for suggestions
> 
> The distributor gear pin?
> 
> Checked timing?
> 
> 
>> 2 nov 2014 kl. 20:13 skrev Charles McCall <charlesmccall at gmail.com>:
>> 
>>  Hi all
>> 
>> 
>>  I just got back from a Supercar event in northern Spain with 35 cars
>>  attending - Lambo, Ferrari, Viper, Porsche, and, as usual, a lone
>>  DeTomaso!
>> 
>> 
>>  The highlight for me without a doubt was an 8-minute burst on the
>>  highway with the police clearing the way for us, cruising at a steady
>>  GPS-indicated 180 k/hr in a 35 car convoy... the people out for a
>>  Sunday drive must have had their minds boggled...
>> 
>> 
>>  Anyway, my engine is not happy. This morning in the hotel parking lot I
>>  really thought that we'd have to skip today's event because it wouldn't
>>  start and didn't sound like it was even thinking about starting. Took
>>  probably 5 minutes of crank-wait-crank-wait before it fired. Yesterday
>>  at the gas station it took 2-3 minutes to start, something that has
>>  never, ever happened before. It is really hard to describe the problem
>>  so much of it is "feel", but I'll do my best.
>> 
>> 
>>  A few weeks ago I noticed that the engine would tend to stumble if I
>>  would floor the throttle, then clear its throat and pull. For example,
>>  I like to heel-and-toe, just because, and when blipping the throttle it
>>  would stumble instead of rev. The engine also felt a little rougher, as
>>  though it vibrated more than I remembered it. I don't remember if this
>>  was before or after I did a short tune-up, by adjusting the valve lash
>>  (I have mechanical lifters), and cleaning the K&N air filter by
>>  applying K&N filter oil, etc. or if it is irrelevant. So I was messing
>>  around in the engine bay recently...
>> 
>> 
>>  This weekend the engine felt considerably worse. It felt like it would
>>  stumble under partial throttle as well. It would stumble a little bit
>>  under trailing throttle going downhill as well, so I don't think it is
>>  a clogged fuel filter.
>> 
>> 
>>  Oil temp is perfect. Oil pressure is perfect. Water temp is perfect.
>>  The engine idles perfectly. But if you floor the gas from idle, it'll
>>  stall. The engine doesn't feel crisp, it feels bloated and soft, if
>>  that makes sense. It feels rough, and it feels like it occasionally
>>  stumbles under constant throttle at highway speed. It pulls hard when
>>  accelerating, but I don't think as hard as it used to, or as high (I
>>  have a 6500 rpm limiting chip in the MSD that it used to pull very
>>  easily to).
>> 
>> 
>>  Suggestions for where to begin looking? And other info that would help
>>  in troubleshooting?
>> 
>> 
>> !DSPAM:54568258260291209923907!
>> _______________________________________________
>> 
>> Detomaso Forum Managed by POCA
>> 
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>> DeTomaso at poca.com
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>> 
>> 
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> 
> 
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> 
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> 
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-------------- next part --------------
   I don't think not seeing anything visibly wrong with a carb on teardown
   means it wasn't the problem. Carb jets are very specific and exact in
   size and having a bit of crud in one will affect fuel flow without
   being noticeable upon inspection.









   -----Original Message-----
   From: Charles McCall <charlesmccall at gmail.com>
   To: 'Mark Charlton' <pantera01826 at rogers.com>
   Cc: 'DeTomaso Mail List' <detomaso at poca.com>
   Sent: Sun, Nov 2, 2014 11:47 am
   Subject: Re: [DeTomaso] Unhappy motor - looking for suggestions
Thanks Mark, but I used 3 full tanks of gas in the past 2 days :-o

The problem has gotten slowly worse, I think.

-----Original Message-----
From: Mark Charlton [[1]mailto:pantera01826 at rogers.com]
Sent: domingo, 2 de noviembre de 2014 20:43
To: Charles McCall
Cc: DeTomaso Mail List
Subject: Re: [DeTomaso] Unhappy motor - looking for suggestions

Charlie,

I had a very similar experience with my car during a long tour in western
Canada. We checked everything and concluded it must be a carb issue. After a
full tear-down of the carb revealed nothing wrong at all, I filled the car
(it was 3/4 empty) and the car ran fine again. We concluded that a stale
batch of 94 octane gas (not commonly available) caused the issue. With any
luck that will be your case too I hope.

Mark Charlton
[2]pantera01826 at rogers.com



On Nov 2, 2014, at 2:20 PM, Charles McCall <[3]charlesmccall at gmail.com> wrote:

> I haven't checked timing, but wouldn't that make the engine run hot?
>
> Would that explain the stumble? It might explain why it doesn't feel as
> crisp as it should
>
> -----Original Message-----
> From: thomas [[4]mailto:thomas at hax.se]
> Sent: domingo, 2 de noviembre de 2014 20:18
> To: Charles McCall
> Cc: <[5]detomaso at poca.com>
> Subject: Re: [DeTomaso] Unhappy motor - looking for suggestions
>
> The distributor gear pin?
>
> Checked timing?
>
>
>> 2 nov 2014 kl. 20:13 skrev Charles McCall <[6]charlesmccall at gmail.com>:
>>
>>  Hi all
>>
>>
>>  I just got back from a Supercar event in northern Spain with 35 cars
>>  attending - Lambo, Ferrari, Viper, Porsche, and, as usual, a lone
>>  DeTomaso!
>>
>>
>>  The highlight for me without a doubt was an 8-minute burst on the
>>  highway with the police clearing the way for us, cruising at a steady
>>  GPS-indicated 180 k/hr in a 35 car convoy... the people out for a
>>  Sunday drive must have had their minds boggled...
>>
>>
>>  Anyway, my engine is not happy. This morning in the hotel parking lot I
>>  really thought that we'd have to skip today's event because it wouldn't
>>  start and didn't sound like it was even thinking about starting. Took
>>  probably 5 minutes of crank-wait-crank-wait before it fired. Yesterday
>>  at the gas station it took 2-3 minutes to start, something that has
>>  never, ever happened before. It is really hard to describe the problem
>>  so much of it is "feel", but I'll do my best.
>>
>>
>>  A few weeks ago I noticed that the engine would tend to stumble if I
>>  would floor the throttle, then clear its throat and pull. For example,
>>  I like to heel-and-toe, just because, and when blipping the throttle it
>>  would stumble instead of rev. The engine also felt a little rougher, as
>>  though it vibrated more than I remembered it. I don't remember if this
>>  was before or after I did a short tune-up, by adjusting the valve lash
>>  (I have mechanical lifters), and cleaning the K&N air filter by
>>  applying K&N filter oil, etc. or if it is irrelevant. So I was messing
>>  around in the engine bay recently...
>>
>>
>>  This weekend the engine felt considerably worse. It felt like it would
>>  stumble under partial throttle as well. It would stumble a little bit
>>  under trailing throttle going downhill as well, so I don't think it is
>>  a clogged fuel filter.
>>
>>
>>  Oil temp is perfect. Oil pressure is perfect. Water temp is perfect.
>>  The engine idles perfectly. But if you floor the gas from idle, it'll
>>  stall. The engine doesn't feel crisp, it feels bloated and soft, if
>>  that makes sense. It feels rough, and it feels like it occasionally
>>  stumbles under constant throttle at highway speed. It pulls hard when
>>  accelerating, but I don't think as hard as it used to, or as high (I
>>  have a 6500 rpm limiting chip in the MSD that it used to pull very
>>  easily to).
>>
>>
>>  Suggestions for where to begin looking? And other info that would help
>>  in troubleshooting?
>>
>>
>> !DSPAM:54568258260291209923907!
>> _______________________________________________
>>
>> Detomaso Forum Managed by POCA
>>
>> DeTomaso mailing list
>> [7]DeTomaso at poca.com
>> [8]http://poca.com/mailman/listinfo/detomaso_poca.com
>>
>>
>> !DSPAM:54568258260291209923907!
>
>
> _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> DeTomaso mailing list
> [9]DeTomaso at poca.com
> [10]http://poca.com/mailman/listinfo/detomaso_poca.com



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DeTomaso mailing list
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References

   1. mailto:pantera01826 at rogers.com?
   2. mailto:pantera01826 at rogers.com
   3. mailto:charlesmccall at gmail.com
   4. mailto:thomas at hax.se?
   5. mailto:detomaso at poca.com
   6. mailto:charlesmccall at gmail.com
   7. mailto:DeTomaso at poca.com
   8. http://poca.com/mailman/listinfo/detomaso_poca.com
   9. mailto:DeTomaso at poca.com
  10. http://poca.com/mailman/listinfo/detomaso_poca.com
  11. mailto:DeTomaso at poca.com
  12. http://poca.com/mailman/listinfo/detomaso_poca.com


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