Misfire 1994 Camry

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Old 28 Apr 2005, 08:55 am   #1 (permalink)
Andrew LeBreton
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Default Misfire 1994 Camry

Assistance needed please to diagnose misfire 1994 4 cylinder Camry (230K
km).

Misfire occurs upto about 2,000rpm only, i.e. when under higher rpm's, no
misfire noticeable. Generally noticeable if engine is slightly labouring, or
if accelerating gently.

Tried so far:
Replaced fuel filter
Replaced air filter
Replaced distributor cap
Replaced rotor
Replaced plugs (approx 20,000km ago, but should go for 100,000km if last set
any indication)
Replaced timing belt (approx 20,000 km ago)
Ignition leads all measured less than 12,060 ohms (my manual says <25,000
ohms is OK)
Various fuel brands tried, no difference

Next option I see is the coil, which is showing a resistance (+ to -
terminal) of 0.8 ohms when cold and upto 1.2 ohms when checked this
afternoon whilst engine still warm. My manual indicates should be 0.6 ohms.
The resistance from + and - to high tension terminal is 12.11ohms, well
within spec according to my manual.

So, as the coil is expensive, please advise
a) if coil is the best part to replace next, or
b) is there something else that I have missed that is more likely to be
causing these symptoms.

Thanks
Andrew


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Old 28 Apr 2005, 09:41 am   #2 (permalink)
Philip
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Default Re: Misfire 1994 Camry

Did you replace the spark plug wires AND the spark plug caps? It's not
uncommon for the plug caps to arc thru the insulator sleeve to the metal
tube surrounding the spark plug.

Andrew LeBreton wrote:
> Assistance needed please to diagnose misfire 1994 4 cylinder Camry
> (230K km).
>
> Misfire occurs upto about 2,000rpm only, i.e. when under higher
> rpm's, no misfire noticeable. Generally noticeable if engine is
> slightly labouring, or if accelerating gently.
>
> Tried so far:
> Replaced fuel filter
> Replaced air filter
> Replaced distributor cap
> Replaced rotor
> Replaced plugs (approx 20,000km ago, but should go for 100,000km if
> last set any indication)
> Replaced timing belt (approx 20,000 km ago)
> Ignition leads all measured less than 12,060 ohms (my manual says
> <25,000 ohms is OK)
> Various fuel brands tried, no difference
>
> Next option I see is the coil, which is showing a resistance (+ to -
> terminal) of 0.8 ohms when cold and upto 1.2 ohms when checked this
> afternoon whilst engine still warm. My manual indicates should be 0.6
> ohms. The resistance from + and - to high tension terminal is
> 12.11ohms, well within spec according to my manual.
>
> So, as the coil is expensive, please advise
> a) if coil is the best part to replace next, or
> b) is there something else that I have missed that is more likely to
> be causing these symptoms.
>
> Thanks
> Andrew




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Old 28 Apr 2005, 05:39 pm   #3 (permalink)
m Ransley
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Default Re: Misfire 1994 Camry

My wires did that, missfire. New wires and I am fine.

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Old 28 Apr 2005, 05:40 pm   #4 (permalink)
m Ransley
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Default Re: Misfire 1994 Camry

I did mean spark plug wires and end caps

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Old 29 Apr 2005, 04:09 am   #5 (permalink)
Andrew LeBreton
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Default Re: Misfire 1994 Camry

Phillip
I have not replaced wires, only the distributor cap. The terminals inside
were very worn, and had a piece of insulating buildup on the rotor side of
each terminal such that I could not get resistance through the lead to the
rotor contact face of the terminal.

I managed to breakaway the buildup, but replaced cap anyway as there was
significant wear on terminals.

What do you mean by spark plug caps?

Also, misfire does not occur when engine is cold, only after warmed up to
near operating temperature.

Andrew

"Philip" <1chip-state1@earthlink.n0t> wrote in message
news:qC6ce.614$V01.104@newsread1.news.atl.earthlin k.net...
> Did you replace the spark plug wires AND the spark plug caps? It's not
> uncommon for the plug caps to arc thru the insulator sleeve to the metal
> tube surrounding the spark plug.
>
> Andrew LeBreton wrote:
> > Assistance needed please to diagnose misfire 1994 4 cylinder Camry
> > (230K km).
> >
> > Misfire occurs upto about 2,000rpm only, i.e. when under higher
> > rpm's, no misfire noticeable. Generally noticeable if engine is
> > slightly labouring, or if accelerating gently.
> >
> > Tried so far:
> > Replaced fuel filter
> > Replaced air filter
> > Replaced distributor cap
> > Replaced rotor
> > Replaced plugs (approx 20,000km ago, but should go for 100,000km if
> > last set any indication)
> > Replaced timing belt (approx 20,000 km ago)
> > Ignition leads all measured less than 12,060 ohms (my manual says
> > <25,000 ohms is OK)
> > Various fuel brands tried, no difference
> >
> > Next option I see is the coil, which is showing a resistance (+ to -
> > terminal) of 0.8 ohms when cold and upto 1.2 ohms when checked this
> > afternoon whilst engine still warm. My manual indicates should be 0.6
> > ohms. The resistance from + and - to high tension terminal is
> > 12.11ohms, well within spec according to my manual.
> >
> > So, as the coil is expensive, please advise
> > a) if coil is the best part to replace next, or
> > b) is there something else that I have missed that is more likely to
> > be causing these symptoms.
> >
> > Thanks
> > Andrew

>
>
>



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Old 29 Apr 2005, 04:11 am   #6 (permalink)
Andrew LeBreton
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Default Re: Misfire 1994 Camry

What do you mean by end caps? I assume you mean the part on the wire lead
that extends into the top of the engine? On mine the wire and end cap
appears to be one piece, and cannot be changed out separately.

Also, misfire does not occur when engine is cold, only after warmed up to
near operating temperature.


"m Ransley" <ransley@webtv.net> wrote in message
news:8624-4271666B-123@storefull-3138.bay.webtv.net...
> I did mean spark plug wires and end caps
>



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Old 29 Apr 2005, 07:08 am   #7 (permalink)
m Ransley
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Default Re: Misfire 1994 Camry

I had the exact same issue, started fine, ran fine cold, missed on
aceleration and warm. New wires fixed it, Just do it, and OEM are best
aftermarket fail in 2-4 yrs, and don`t forget the silicone grease on the
boot.

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Old 29 Apr 2005, 07:09 am   #8 (permalink)
m Ransley
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Default Re: Misfire 1994 Camry

End caps, a complete wire set , not just wires.

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Old 29 Apr 2005, 09:37 am   #9 (permalink)
Philip
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Default Re: Misfire 1994 Camry

Spark plug caps are: The plastic insulator tube on the end of the spark
plug wire that actually reaches down into the spark plug well and physically
connects TO the spark plug.

Andrew LeBreton wrote:
> Phillip
> I have not replaced wires, only the distributor cap. The terminals
> inside were very worn, and had a piece of insulating buildup on the
> rotor side of each terminal such that I could not get resistance
> through the lead to the rotor contact face of the terminal.
>
> I managed to breakaway the buildup, but replaced cap anyway as there
> was significant wear on terminals.
>
> What do you mean by spark plug caps?
>
> Also, misfire does not occur when engine is cold, only after warmed
> up to near operating temperature.
>
> Andrew
>
> "Philip" <1chip-state1@earthlink.n0t> wrote in message
> news:qC6ce.614$V01.104@newsread1.news.atl.earthlin k.net...
>> Did you replace the spark plug wires AND the spark plug caps? It's
>> not uncommon for the plug caps to arc thru the insulator sleeve to
>> the metal tube surrounding the spark plug.
>>
>> Andrew LeBreton wrote:
>>> Assistance needed please to diagnose misfire 1994 4 cylinder Camry
>>> (230K km).
>>>
>>> Misfire occurs upto about 2,000rpm only, i.e. when under higher
>>> rpm's, no misfire noticeable. Generally noticeable if engine is
>>> slightly labouring, or if accelerating gently.
>>>
>>> Tried so far:
>>> Replaced fuel filter
>>> Replaced air filter
>>> Replaced distributor cap
>>> Replaced rotor
>>> Replaced plugs (approx 20,000km ago, but should go for 100,000km if
>>> last set any indication)
>>> Replaced timing belt (approx 20,000 km ago)
>>> Ignition leads all measured less than 12,060 ohms (my manual says
>>> <25,000 ohms is OK)
>>> Various fuel brands tried, no difference
>>>
>>> Next option I see is the coil, which is showing a resistance (+ to -
>>> terminal) of 0.8 ohms when cold and upto 1.2 ohms when checked this
>>> afternoon whilst engine still warm. My manual indicates should be
>>> 0.6 ohms. The resistance from + and - to high tension terminal is
>>> 12.11ohms, well within spec according to my manual.
>>>
>>> So, as the coil is expensive, please advise
>>> a) if coil is the best part to replace next, or
>>> b) is there something else that I have missed that is more likely to
>>> be causing these symptoms.
>>>
>>> Thanks
>>> Andrew



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Old 29 Apr 2005, 05:13 pm   #10 (permalink)
Ken Day
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Default Re: Misfire 1994 Camry

On Thu, 28 Apr 2005 23:55:13 +1000, "Andrew LeBreton"
<owls_eyes.no.spam....@.....hotmail.com> wrote:

>Assistance needed please to diagnose misfire 1994 4 cylinder Camry (230K
>km).
>
>Misfire occurs upto about 2,000rpm only, i.e. when under higher rpm's, no
>misfire noticeable. Generally noticeable if engine is slightly labouring, or
>if accelerating gently.
>
>Tried so far:
>Replaced fuel filter
>Replaced air filter
>Replaced distributor cap
>Replaced rotor
>Replaced plugs (approx 20,000km ago, but should go for 100,000km if last set
>any indication)
>Replaced timing belt (approx 20,000 km ago)
>Ignition leads all measured less than 12,060 ohms (my manual says <25,000
>ohms is OK)
>Various fuel brands tried, no difference
>
>Next option I see is the coil, which is showing a resistance (+ to -
>terminal) of 0.8 ohms when cold and upto 1.2 ohms when checked this
>afternoon whilst engine still warm. My manual indicates should be 0.6 ohms.
>The resistance from + and - to high tension terminal is 12.11ohms, well
>within spec according to my manual.
>
>So, as the coil is expensive, please advise
>a) if coil is the best part to replace next, or
>b) is there something else that I have missed that is more likely to be
>causing these symptoms.
>
>Thanks
>Andrew

I see nothing has been said about the plugs which are a very likely
cuprit in the symptoms you describe.
I would check and/or replace the plugs. Don't rule them out simply
because they only have 20,000 km on them.They could very well be bad..
Pull them and check the gap and also look at the color and condition
of the plugs. If you have a manual it should have pictures that tell
you what the different color and conditions tell you about your
engine. It's a good idea to do this between plug changes anyway as it
can alert you to possible internal problems.

By the way,what type plugs and number are you running ? Very important
to run the rcommended plugs in this engine.

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