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P301 Dtc; Drivin me crazy !
Topic Started: Jul 2 2009, 11:01 AM (162 Views)
Azbornman Jul 2 2009, 11:01 AM Post #1
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 Hello all, I have a friend with a 1999 metro, keeps getting P301 DTC.
I have replaced all plugs, wires and switched the coils around to see if the coil was bad.
Possibly telling me the coil was bad by expecting P304 if it was. But still getting P301.
Codes were erased several time by me.

Any Ideas?


Thanks....
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Manny Jul 2 2009, 11:21 AM Post #2
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 Is that the 1.3L Multi Point Fuel Injected engine ?
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Azbornman Jul 2 2009, 11:35 AM Post #3
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Manny
Jul 2 2009, 11:21 AM
Is that the 1.3L Multi Point Fuel Injected engine ?
Yes Sir it is 1.3L.
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Manny Jul 2 2009, 12:29 PM Post #4
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 Did you check all the hoses on intake as well as the Crank. position sensor behind the underdrive pulley ?

try to get electric contact cleaner and remove the distributor cap... then spray it out inside distributor assembly,

:)
Edited by Manny, Jul 2 2009, 12:47 PM.
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Bad Bent Jul 2 2009, 06:27 PM Post #5
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Facetious Educated Donkey

 My favorite OBDII site is: www.obd-codes.com/p0301.

In short Cylinder #1. Possible causes: Faulty spark plug or wire, Faulty coil (pack), Faulty oxygen sensor(s), Faulty fuel injector, Burned exhaust valve, Faulty catalytic converter(s), Running out of fuel, Poor compression, Defective computer.

Under solutions, besides what you have done, it lists Catalytic Converter and even fuel injector, related to Manny's suggestion of the CPS. :thumb
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Johnny Mullet Jul 2 2009, 08:50 PM Post #6
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"Geo Whisperer"

 First check for spark. Remove the wire on #1 cylinder, place an old known good plug on the wire and place it to the metal touches the valve cover or something metal. Have an assistant crank it over while you look for spark. If you have spark, next you need to run it a little with it all together and then shut it off and remove the #1 plug. If you smell gas, then the next step is to rent a compression tester and test the cylinder compression.
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mwebb Jul 2 2009, 09:15 PM Post #7
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 Hello all, I have a friend with a 1999 metro, keeps getting P301 DTC.
I have replaced all plugs, wires and switched the coils around to see if the coil was bad.
Possibly telling me the coil was bad by expecting P304 if it was. But still getting P301.
Codes were erased several time by me.

Any Ideas?


Thanks....
P0301 = misfire on cylinder 1
P0300 = random misfire , unknown cylinder ,
unusual to have one and not the other
be aware that sometimes Mr PCM mis identifies the cylinder that is misfiring .

i see you have a scan tool
so what are short term and long term fuel trims at idle and 2k rpm hot ? the answer may reveal that you have a vacuum leak and a vacuum leak near one cylinder can cause single cylinder misfire

using a vacuum gauge ....
intake vacuum at hot idle - should be steady smooth at about 20" at sea level
intake vacuum at hot 2k to 2.5 k rpm - should be about 2" greater than idle value
intake vacuum peaks at WideOpenThrottle snap and just after on decel - should be 0" at WOT then about 25" on decel .

IF the vacuum gauges has any flutter at all , you have a burned valve , does not matter which cylinder , the cylinder head will have to come off .

possible bad injector , swap the injector with another cylinder and see if miss follows , see the top sentence .
possible , clogged EGR passage to cylinder 1

cat converter will not cause single cylinder misfire .
cavitation in fuel pump can pump vapor bubbles into fuel rail , last cylinder in the rail gets vapor , not fuel .
a bastard to find with out fuel flow meter or fuel pump current waveform or
if you had a scope , spark waveforms would show lean cylinder ...

compression test -
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Woodie Jul 3 2009, 07:22 AM Post #8
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Azbornman
Jul 2 2009, 11:01 AM
Hello all, I have a friend with a 1999 metro, keeps getting P301 DTC.
I have replaced all plugs, wires and switched the coils around to see if the coil was bad.
Possibly telling me the coil was bad by expecting P304 if it was. But still getting P301.
Codes were erased several time by me.

Yes, my first idea is that you're thinking clearly and have a good grasp on what's going on. 0301 without 0300 or 0304 indicates that it's cylinder one specifically, not a random misfire. There's no distributor and no EGR, O2 sensor and catalytic converter could not possibly cause only one to misfire. Crank position sensor and Cam position sensor or floppy timing belt connecting the two could conceivably cause this, but that's far fetched, I doubt it very much. You've changed the #1 plug and wire, and swapped coils, those were the most likely causes. mwebb points out a good thing with the injector, swap them around. If that fails, it's mechanical, get a compression test.
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