View Full Version : p0200 code help


irishws6
07-21-2012, 09:44 PM
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

rjparth
07-22-2012, 08:20 AM
http://www.obd-codes.com/p0200

I'd start here. Some simple voltage checks may get you moving toward a solution.

crainholio
07-22-2012, 10:24 AM
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.

irishws6
07-22-2012, 11:37 AM
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

irishws6
07-22-2012, 11:41 AM
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?

crainholio
07-22-2012, 12:12 PM
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.

irishws6
07-22-2012, 12:44 PM
Thanks crainholio, ill do that asap

irishws6
07-22-2012, 12:46 PM
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??

crainholio
07-22-2012, 03:05 PM
Yes, disconnect both ends and probe the wire from end to end.

irishws6
07-22-2012, 05:01 PM
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

crainholio
07-22-2012, 05:29 PM
Set your meter's range to 20 Ohms or 100 Ohms, whichever it has.

irishws6
07-22-2012, 05:35 PM
Meter has omh range from 200, 2k,20k,200k,2m.

irishws6
07-22-2012, 05:39 PM
Like i said cant get constant reading flucuates into many random numbers disent hold steady on any value

crainholio
07-22-2012, 05:42 PM
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.

irishws6
07-22-2012, 05:46 PM
Crainholio man, thats exactly what im doin, no constant reading, what the hell

crainholio
07-22-2012, 05:47 PM
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?

crainholio
07-22-2012, 05:51 PM
Cross your probes and verify the meter reads 0 Ohms...

irishws6
07-22-2012, 06:55 PM
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 ????

crainholio
07-22-2012, 08:27 PM
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.

irishws6
07-22-2012, 08:54 PM
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

crainholio
07-22-2012, 10:26 PM
Post a picture of the wire end...if the boot came off, I'd junk it and get a new set.

You're looking for significant variation between the 8 plug wires, set your meter for 2K Ohm range and probe away. But like I said, if the boot separated from the wire it's time for new ones anyway.

irishws6
07-23-2012, 07:11 AM
No wire and metal boot come out together the metel plug end had a spring attached at the very end

crainholio
07-23-2012, 07:15 AM
No wire and metal boot come out together the metel plug end had a spring attached at the very end

Got ya, the spring is part of the assembly and removes w/ the wire & boot.

irishws6
07-23-2012, 07:29 AM
Crainholio thank you so much for your help and patience, gona tackle it again this evening when i get home, hope its nothing major, i barely drive my baby!

irishws6
07-23-2012, 07:19 PM
and now the fun begains

pulled all plug wires, they i believe must be the stock ones- delphi packard??
now to numbers
1-337 ohms
2-335ohms
3-333ohms
4-329ohms
5- checked and removed ohm ranging from 320 down to below the 290 mark, hard to get a fixed reading
6-333ohms
7-348-350ohms this one was suspicious too. checked a couple of times
8-335ohms

so what you guys thing about these numbers???could 5 be acting out????
where could i pick up a single plug wire like this??
also when reincerting the wires on pliug end i found it almost impossible to hear a click, i did hear the two clicks on the coil end, just pushed them into plugs end as hard as i could.

also i removed the air tubes from the passenger side, do i need a replacement gasket or would rvt do the trick??

STREETSLEEPER
07-23-2012, 08:42 PM
and now the fun begains

pulled all plug wires, they i believe must be the stock ones- delphi packard??
now to numbers
1-337 ohms
2-335ohms
3-333ohms
4-329ohms
5- checked and removed ohm ranging from 320 down to below the 290 mark, hard to get a fixed reading
6-333ohms
7-348-350ohms this one was suspicious too. checked a couple of times
8-335ohms

so what you guys thing about these numbers???could 5 be acting out????
where could i pick up a single plug wire like this??
also when reincerting the wires on pliug end i found it almost impossible to hear a click, i did hear the two clicks on the coil end, just pushed them into plugs end as hard as i could.

also i removed the air tubes from the passenger side, do i need a replacement gasket or would rvt do the trick??

Those are high numbers for good wires. Good MSD superconductor wires have a real low number per foot. I can't remember right off the bat but i think they may even be negative ohms per foot. Look it up it might not be that low but its real low. But that won't give a code like that. Could be a cracked porcilin around a plug. However from what I have heard you say I think it might be a bad connector in the plug wire end. I would replace the whole lot with good wires. Not the trash from the major automotive parts places.

irishws6
07-23-2012, 08:57 PM
havent owned the car that long only driven it about 1500 miles, car ran real low on gas one day and this problem started for me afterwards, dosent throw any misfire on any cylinder, just the p0200 injection malfunction.can feel the car hesitating when it happens.

if i waas to replace wires are they any direct fit, which dont require any cutting or modding?? stock,oem etc?? like i said this car is gona be for me to enjoy when im older and no longer live in nyc, its garaged 24/7 in my own garage, speeed and performance dont bother me, i just love these babies for what they are

crainholio
07-23-2012, 09:15 PM
The only over-the-counter parts store wires I've run were from NAPA. Just slipped the stainless steel boot covers and springs from the old wires to the new ones, dab of dielectric grease inside the plug end and coil end, and they clicked right into place.

If I have my preference, I get a set of GM red LS6 wires from an online wholesaler.

irishws6
07-23-2012, 09:47 PM
ok ill look into new wires, and what about plugs??? hearing and reading lots of different things in regards plugs, ac delco, ngk etc..

so you really think my plug wires are at fault, the above numbers were .333, .335 .329 etc...
thanks for all the help

crainholio
07-23-2012, 09:50 PM
ok ill look into new wires, and what about plugs??? hearing and reading lots of different things in regards plugs, ac delco, ngk etc..

so you really think my plug wires are at fault, the above numbers were .333, .335 .329 etc...
thanks for all the help

Based on the lack of an audible click on the plug end, I'd say the wires are in need of replacement.

I've never seen a case where spark plugs caused a P0200 code.

irishws6
07-23-2012, 09:56 PM
im at a loss too, ive checked all wires on coils and back to pcm, nothing nipped or cut, injectors all check out too, only other issue is the cracked pcv grommet which read on here before causing this problem.

got all my wires on passanger side to snap into place just hard to get them to click on drivers.
would the naba leads be ok for a car thats rearly driven.

i know i keep repeating this but could the low gas have fouled one of my injectors???

irishws6
07-23-2012, 10:06 PM
just looking at a web site, MSD Super Conductor Spark Plug Wires, 98-2002 LS1, for just over 60 bucks. good plugs??? also the ngk tr55s for plugs??
any imput

irishws6
07-24-2012, 12:27 AM
just purchased the msds and new tr55 plugs from a vendor on this site, may as well put them in seens as im in the mind set to do it now, hopefully the new wires will solve my problem.

rjparth
07-24-2012, 07:24 AM
irishws6, you mentioned the injectors all checked out, did you probe out the driver circuits to make sure there's not a problem there? That link I posted early on has that procedure detailed. I respect the experience on the forum that this code can be created by an ignition problem, but it's meant to alert you to a voltage problem on the injector circuit.

Here's some additional info http://www.ls2.com/boggs/dtcs/DTC%20P0200.htm

irishws6
07-24-2012, 04:43 PM
Rjparth, i wouldnt have a clue how to even follow those guidelines, electronics is sadly not my thing, could barely operate the multi- meter to check the plug wires. What in simple terms would i have to do to check the drivers?? Would i have to wait until the problem exsists to get a true diagnosis- it dosent appear to do it cold, only when cars fully warmed up and im giving it some, like pulling off from a light or stop sign.

crainholio
07-24-2012, 09:13 PM
just purchased the msds and new tr55 plugs from a vendor on this site, may as well put them in seens as im in the mind set to do it now, hopefully the new wires will solve my problem.

Good (but not great) move, be sure you check the gap on the plugs and adjust as needed to get them right prior to installation. Decent gap gauge is a cheap but good investment.

And remember to apply a dab of dielectric grease to the plug and coil boots prior to installation. Let us know how it goes.

btlegacy
02-11-2013, 01:03 AM
Did the new plugs and wires resolve the codes?