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Ignition or fuel?



 
 
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  #1  
Old October 17th 04, 11:58 PM
Leon van Dommelen
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Default Ignition or fuel?


I have a problem with the engine heavily backfiring in the exhaust
at 5000+ rpm if I put my foot into it, particularly during merging
operations on the Interstate. Maybe my foot is blocking the air
flow and I should take it out of the exhaust?

Anyway, a look below the hood showed a yellow sort of dust on the
plug wires, and maybe one connector not quite as well down as
possible, but messing around with it did not change a thing.
Anyway, I changed the plug wires and spark plugs anyway, even
if they were fairly recent. The way it feels, however, is much
like the rev limiter feels (burning in the exhaust, suddenly
total lack of power.) On the other hand, during normal driving
I have an occasional stutter where the wideband oxygen sensor drops
down, suggesting (AFAIK) that the fuel is not being burned, hence
an ignition problem.

Does anybody have seen something like this? It cramps my style if
there is a 50/50 chance of the engine refusing to cooperate with what
I want to do. Before you know it, I will be ending up driving 53 mph
in the left hand lane of every Interstate in the US to avoid having
to merge.

Leon

--
Leon van Dommelen Bozo, the White 96 Sebring Miata .)
http://www.dommelen.net/miata
EXIT THE INTERSTATES (Jamie Jensen)
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  #2  
Old October 18th 04, 01:01 AM
Expmiata
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Leon
I know you have already checked, but by any chance, water has gotten into spark
plug well?


~Cissy :-)
  #4  
Old October 18th 04, 02:26 AM
Larry Gadbois
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Default

Hi Leon,

You could have a dying coil pack. POPSTOY suggested that the terminals
inside the coil pack can get corroded causing bad connections. Pull the
wires and look for a white powder inside on the connectors.

Water in the gas can cause this kind of problem. It accumulates in the
bottom of the fuel filter as well as the bottom of the fuel tank. Sometimes
that water can be sucked into the fuel flow at WOT. A alcohol fuel additive
can be purchase that allows the water to mix with the gas and be burned
without the backfiring.

Three feet in the exhaust will certainly result in a yard of backfiring.



"Leon van Dommelen" > wrote in message
...
>
> I have a problem with the engine heavily backfiring in the exhaust
> at 5000+ rpm if I put my foot into it, particularly during merging
> operations on the Interstate. Maybe my foot is blocking the air
> flow and I should take it out of the exhaust?
>
> Anyway, a look below the hood showed a yellow sort of dust on the
> plug wires, and maybe one connector not quite as well down as
> possible, but messing around with it did not change a thing.
> Anyway, I changed the plug wires and spark plugs anyway, even
> if they were fairly recent. The way it feels, however, is much
> like the rev limiter feels (burning in the exhaust, suddenly
> total lack of power.) On the other hand, during normal driving
> I have an occasional stutter where the wideband oxygen sensor drops
> down, suggesting (AFAIK) that the fuel is not being burned, hence
> an ignition problem.
>
> Does anybody have seen something like this? It cramps my style if
> there is a 50/50 chance of the engine refusing to cooperate with what
> I want to do. Before you know it, I will be ending up driving 53 mph
> in the left hand lane of every Interstate in the US to avoid having
> to merge.
>
> Leon
>
> --
> Leon van Dommelen Bozo, the White 96 Sebring Miata .)
> http://www.dommelen.net/miata
> EXIT THE INTERSTATES (Jamie Jensen)



  #5  
Old October 18th 04, 03:58 AM
Dana H. Myers
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Larry Gadbois wrote:

> Water in the gas can cause this kind of problem. It accumulates in the
> bottom of the fuel filter as well as the bottom of the fuel tank. Sometimes
> that water can be sucked into the fuel flow at WOT. A alcohol fuel additive
> can be purchase that allows the water to mix with the gas and be burned
> without the backfiring.


Are you sure the water is burned after mixing with the gasoline?

;-)

Dana
  #6  
Old October 18th 04, 04:13 AM
Chas Hurst
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"Dana H. Myers" > wrote in message
...
> Larry Gadbois wrote:
>
> > Water in the gas can cause this kind of problem. It accumulates in the
> > bottom of the fuel filter as well as the bottom of the fuel tank.

Sometimes
> > that water can be sucked into the fuel flow at WOT. A alcohol fuel

additive
> > can be purchase that allows the water to mix with the gas and be burned
> > without the backfiring.

>
> Are you sure the water is burned after mixing with the gasoline?
>
> ;-)
>
> Dana


What Dana said.
I'd try changing the fuel filter.
Chas Hurst


  #7  
Old October 18th 04, 01:20 PM
Leon van Dommelen
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"Chas Hurst" > wrote:

>
>"Dana H. Myers" > wrote in message
...
>> Larry Gadbois wrote:
>>
>> > Water in the gas can cause this kind of problem. It accumulates in the
>> > bottom of the fuel filter as well as the bottom of the fuel tank.

>Sometimes
>> > that water can be sucked into the fuel flow at WOT. A alcohol fuel

>additive
>> > can be purchase that allows the water to mix with the gas and be burned
>> > without the backfiring.

>>
>> Are you sure the water is burned after mixing with the gasoline?
>>
>> ;-)
>>
>> Dana

>
>What Dana said.
>I'd try changing the fuel filter.
>Chas Hurst


Thanks for all responses. I don't think I am going to mess with
the fuel filter, though. I don't play golf. It is obviously
more than time that I make an appointment with a shop and have
them replace all suspected parts. The fuel additive sounds a good
one to try right away.

Leon

--
Leon van Dommelen Bozo, the White 96 Sebring Miata .)
http://www.dommelen.net/miata
EXIT THE INTERSTATES (Jamie Jensen)
  #8  
Old October 19th 04, 01:36 AM
Larry Gadbois
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The water doesn't burn unless you get your foot in it!


"Dana H. Myers" > wrote in message
...
> Larry Gadbois wrote:
>
>> Water in the gas can cause this kind of problem. It accumulates in the
>> bottom of the fuel filter as well as the bottom of the fuel tank.
>> Sometimes that water can be sucked into the fuel flow at WOT. A alcohol
>> fuel additive can be purchase that allows the water to mix with the gas
>> and be burned without the backfiring.

>
> Are you sure the water is burned after mixing with the gasoline?
>
> ;-)
>
> Dana



  #9  
Old October 19th 04, 04:56 AM
Dana H. Myers
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Default

Chas Hurst wrote:

> What Dana said.
> I'd try changing the fuel filter.
> Chas Hurst


I'd sort of suspect ignition before I'd suspect
running out of fuel.

Dana
  #10  
Old October 19th 04, 01:10 PM
Leon van Dommelen
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Default

"Dana H. Myers" > wrote:

>Chas Hurst wrote:
>
>> What Dana said.
>> I'd try changing the fuel filter.
>> Chas Hurst

>
>I'd sort of suspect ignition before I'd suspect
>running out of fuel.


It may be. Should I tell them to test the ignition coil as
per the manual, or just replace it to be safe? Anyone know
how much the thing costs?

Leon

--
Leon van Dommelen Bozo, the White 96 Sebring Miata .)
http://www.dommelen.net/miata
EXIT THE INTERSTATES (Jamie Jensen)
 




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