1990 camry 4 banger-engine missing

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Old 18 Sep 2004, 02:43 pm   #1 (permalink)
swbtmis
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Default 1990 camry 4 banger-engine missing

car starts fine (115,000 miles)
runs fine cold.
when heats it it stutters/misses when I start out from a stop.
with a/c on it misses even worse.

is this electrical problem? or fuel type problem.



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Old 18 Sep 2004, 08:56 pm   #2 (permalink)
jimhigh66
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Default Re: 1990 camry 4 banger-engine missing

It sounds electrical -- but not positive. A weak spark will typically show
up when the engine is under load which it is when you start from a stop,
and note that the air conditioner is an extra load on the engine. Do you
notice that when you are up to speed it tends to miss when you try to
accelerate further, or when going up a hill ?
Regarding it happening after warm-up: Marginal electrical components are
notorious for failing when heated. Not on a Toyota, but on other cars
I've had it happen with a coil and also an ignition module. ( The way I
determined the ignition module: I'd heat the module and install it in the
car and the car wouldn't run. I'd then take it out and put it in the
refrigerator and then install it and the car would run. )
Defective spark plug wires will also cause missing under load but it's
usually not related to temperature.
Good Luck. Jim H.


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Old 20 Sep 2004, 03:40 pm   #3 (permalink)
swbtmis
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Default Re: 1990 camry 4 banger-engine missing

yep.
I just tested it driving up a hill.
it started to miss pretty bad. thought I could conk out.

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Old 24 Sep 2004, 08:57 pm   #4 (permalink)
jimhigh66
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Default Re: 1990 camry 4 banger-engine missing

Just now saw your reply. If you haven't fixed it yet: I'm pretty confident
it's an electrical problem.
How are your plugs ?
If you have an ohmmeter you can measure your spark plug wires (you'll have
to take the distributor cap off to get at those ends. If it's like an '89
there are three screws. Note: Use caution if a screw feels "frozen" --
use penetrating oil and if you can move it at all turn it one way and then
the other (counter-clockwise, clockwise, counter...) without too much force
and it will eventually turn out. You don't want to twist it off ! )
My relatively new spark plug wires measure about 1500 ohms for the longest
wire. I'd be suspicious of anything over 4-5000 ohms.
Beyond that I'd suspect the coil or ignitor ("ignition module").
Unfortunately these items are rather pricy and you may only be able to
determine what is faulty by replacing it. You could try cooling the
ignitor (mine is located on the battery tray -- probably has the number
"153" on it -- and see if you get any improvement.
good luck, Jim H.

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Old 26 Sep 2004, 04:42 pm   #5 (permalink)
swbtmis
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Default Re: 1990 camry 4 banger-engine missing

thanks.
I bought plugs and wired and rotor and gas filter etc etc.
I am in the process of tuning it up.
but I screwd up the air cleaner housing wriring. I just left a post about
it.

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Old 27 Sep 2004, 06:43 am   #6 (permalink)
m Ransley
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Default Re: 1990 camry 4 banger-engine missing

My ignition coil does that, Is it worse when humid or after a rain,
then it is the coil. Park inside one night if it is better it is the
coil

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