still giving code for engine miss after new plugs po300

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still giving code for engine miss after new plugs po300

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Cadillac Forums >> Cadillac Models >> Cadillac STS >> still giving code for engine miss after new plugs po300

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still giving code for engine miss after new plugs po300 - 1/12/2008 4:40:12 AM

dpv1977

Posts: 13
Joined: 12/4/2007
Status: offline

Hi, what would be the next thing to replace after plugs. Car is still giving code po300. My assumption would be the coil packs. Before plugs code was for misfire in cylinder 6. Thankyou

Post #: 1

RE: still giving code for engine miss after new plugs p... - 1/12/2008 7:15:52 AM

slowroll

Posts: 1254
Joined: 10/3/2007
Status: offline

What did coil tips and spark plug boots look like when coil packs were off? You really need scanner to check out, or play expensive game of guess. Taking to dealer/shop maybe your best option.

(in reply to dpv1977)

Post #: 2

RE: still giving code for engine miss after new plugs p... - 1/12/2008 1:29:37 PM

pjbizjak

Posts: 6
Joined: 1/1/2008
Status: offline

Hi; Is the car using more oil than normal? I had a 2000 STS V8 and had a miss problem when the car was started cold causing error code. Took to dealer and they replaced the plugs and wires/boots etc. Car was OK for a couple days and then started missing again, took it back to the dealer and they told me that I have a blown head gasket and water was getting in the cylinder causing the miss, however I never lost a ounce of water! That's why I asked about oil consumption, I believe oil not water was getting in the cylinder causing the miss, I was using 1 quart of oil every 1000 mi. After the car warmed up, burning off the oil, everything was fine.

(in reply to slowroll)

Post #: 3

RE: still giving code for engine miss after new plugs p... - 1/12/2008 3:21:25 PM

stomper

Posts: 1447
Joined: 6/18/2007
Status: offline

quote:

ORIGINAL: pjbizjak

Hi; Is the car using more oil than normal? I had a 2000 STS V8 and had a miss problem when the car was started cold causing error code. Took to dealer and they replaced the plugs and wires/boots etc. Car was OK for a couple days and then started missing again, took it back to the dealer and they told me that I have a blown head gasket and water was getting in the cylinder causing the miss, however I never lost a ounce of water! That's why I asked about oil consumption, I believe oil not water was getting in the cylinder causing the miss, I was using 1 quart of oil every 1000 mi. After the car warmed up, burning off the oil, everything was fine.

if you look in our FAQ section, you will find a exhaust gas in coolant test, inexpensive.
if there was oil consumption, there may well be rings sticking.

there is a cleaner for that, as well as the great WOT .. look in our FAQ section

_____________________________

"If you're going through hell, keep going"
~ Winston Churchill

(in reply to pjbizjak)

Post #: 4

RE: still giving code for engine miss after new plugs p... - 1/12/2008 9:06:06 PM

dpv1977

Posts: 13
Joined: 12/4/2007
Status: offline

Thankyou for the advise. I will be doing the coolant test. The car does use a lot of oil, about 1 quart every 1000 just like pjbizjak but does not appear to loose coolant. I've started the WOT but no results yet and will be using a cleaner also....oh and the rubber boots and coil tips looked very nice and clean.

(in reply to stomper)

Post #: 5