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p0200 code help

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Old 07-21-2012, 08:44 PM   #1
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Default p0200 code help

greetings all,
car seems a little hesitatant/spluttery and jerky especially when moving from 1st to second gear and then car just threw the code p0200, ive searched and realise what the code means.
however where do i even begain to check for problems??

the car is only driven maybe once or twich a month for less than 100 miles,
i first thought it may be bad gas or gas sitting in tank fouling up injectors??? would this cause the code and hesitation??

i also spotted that my pcv valve grommet is split open woild this cause the code, remember reading somewhere about this causing the problem??
any help or imput greatly appreciated
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Old 07-22-2012, 07:20 AM   #2
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http://www.obd-codes.com/p0200

I'd start here. Some simple voltage checks may get you moving toward a solution.
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Old 07-22-2012, 09:24 AM   #3
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The only time I've seen P0200 on mine was found to be a bad spark plug wire...the connector had separated from the wire and must have been intermittently losing contact.

The coils and injectors for each bank share a common 12VDC feed, so an electrical problem with the ignition system can apparently show up in the PCM's injector monitoring logic.

I'd start by using a meter to check resistance on each of the 8 injectors, and if none are out of range then I'd pull the spark plug wires and check resistance on each of them. (in my case, removing the wire left the metal clip on the spark plug)

If still no findings, simply apply a dab of dielectric grease to each end of the coil wires and reinstall them...verify a nice clear click when each end seats. My GM wires give 2 clicks on the coil end, and 1 click on the spark plug end.
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Old 07-22-2012, 10:37 AM   #4
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Ok im gona go down and take a look today see if anythings loose etc, like i said checked around last nite and did notice the pcv valve/ housing was cracked open
In regards testing where do i evenstart, im good with mechanical issue but stumped with regards electrical. I have a multi meter what setting do i put it on?? Do i prob the injector itself or the harness?? Car on or off?

Car only seems to misbehave when its fully warmed up
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Old 07-22-2012, 10:41 AM   #5
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Could bad gas or low gas level cause this??? I let it run extemely low one day and think my prob started after this, also im a demon for leaving it quarter full in garage for weeks, been very hot and humid in nyc as late would moisture have gotten in tank?
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Old 07-22-2012, 11:12 AM   #6
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Quote:
Originally Posted by irishws6 View Post
Ok im gona go down and take a look today see if anythings loose etc, like i said checked around last nite and did notice the pcv valve/ housing was cracked open
In regards testing where do i evenstart, im good with mechanical issue but stumped with regards electrical. I have a multi meter what setting do i put it on?? Do i prob the injector itself or the harness?? Car on or off?

Car only seems to misbehave when its fully warmed up
Ignition off.

Set your meter to Ohms. Verify the probes are hooked up to the meter correctly for Ohms, some meters use different plug-in connections but they're usually labeled clearly.

Disconnect each injector, probe across the injector's two pins (orientation doesn't matter) and write down the resistance...should be around 12 Ohms. Post all 8 injector results.

If any of the injectors is significantly different than the rest, stop testing until it's replaced.

If none of the injectors is significantly different, move on to the plug wires. Remove each, probe from end to end ( have to reach up into the plug end to get the metal connector clip) and write down the resistance. Post all 8 plug wire results.
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Old 07-22-2012, 11:44 AM   #7
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Thanks crainholio, ill do that asap
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Old 07-22-2012, 11:46 AM   #8
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In regards end to end on plug wires, one probe in plug end other probe in coil end??? Totally disconnect plug wire from plug and coil??
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Old 07-22-2012, 02:05 PM   #9
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Yes, disconnect both ends and probe the wire from end to end.
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Old 07-22-2012, 04:01 PM   #10
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Ok so went down, removed harnesses from injectors, set meter to ohms and to 200k, probed each injector but im getting all kinds of crazy readings, going up and down nothing constant 73.5 .100 etc am im doning some thing wrong. Ignition off key removed, car cold since last nite, not seening any constant reading on any injector.
Please help guys
Many thanks
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Old 07-22-2012, 04:29 PM   #11
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Set your meter's range to 20 Ohms or 100 Ohms, whichever it has.
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Old 07-22-2012, 04:35 PM   #12
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Meter has omh range from 200, 2k,20k,200k,2m.
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Old 07-22-2012, 04:39 PM   #13
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Like i said cant get constant reading flucuates into many random numbers disent hold steady on any value
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Old 07-22-2012, 04:42 PM   #14
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Quote:
Originally Posted by irishws6 View Post
Meter has omh range from 200, 2k,20k,200k,2m.
Set it to 200 Ohms and re-test, be sure the red probe is plugged into the right port on your meter, and be sure you've got a good seat on the two injector terminals.
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Old 07-22-2012, 04:46 PM   #15
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Crainholio man, thats exactly what im doin, no constant reading, what the hell
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Old 07-22-2012, 04:47 PM   #16
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Even w/ the meter set to 200 Ohms? And you're dead sure the red probe is plugged into the right port on your meter?
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Old 07-22-2012, 04:51 PM   #17
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Cross your probes and verify the meter reads 0 Ohms...
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Old 07-22-2012, 05:55 PM   #18
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Ok sorry finally got it, checked all from 1-8 and all within 12.1 to 12.5.
Also pulled each harness with engine running and each time once i pilled one the engine ran rougher, couldnt get no7 on quick enough and it threw service engine soon.
Niw i quess i gotta check plug wires, pulled one off and it had spring on end, is this normal, or did i break it? Whats the best way to remove wires, twist yank ????
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Old 07-22-2012, 07:27 PM   #19
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Twist repeatedly to break the seal loose, then pull on the boot (not the wire) while continuing to twist.

I start on the coil end first as they're easier to remove, and when that end is off you can twist the plug end by the boot in a complete circle.
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Old 07-22-2012, 07:54 PM   #20
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Ok great, what ohms should i be looking for in wires, also the spring on plug end, is that normal or did i separate the end of wire
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Old 07-22-2012, 07:54 PM
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