p0300 Misfire Code Urgent Help!
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p0300 Misfire Code Urgent Help! Hey guys I"m getting a misfire code after doing the following:
Removed MAF Ends and went back to stock
Replaced filter in lid
Drove car without sensor plugged into the lid
Removed MAFT
Lastly, (and this is the dumb one) tried to reboot the computer because of the code and accidentally tried to start the car with fuse put in the TCS BAT spot instead of PCM BAT.
Anyways, now I get the code (tried to clear it and it came back) car idles like crap could someone PLEASE help a brotha out.
<small>[ November 12, 2002, 06:25 PM: Message edited by: thefritz1 ]</small>
Removed MAF Ends and went back to stock
Replaced filter in lid
Drove car without sensor plugged into the lid
Removed MAFT
Lastly, (and this is the dumb one) tried to reboot the computer because of the code and accidentally tried to start the car with fuse put in the TCS BAT spot instead of PCM BAT.
Anyways, now I get the code (tried to clear it and it came back) car idles like crap could someone PLEASE help a brotha out.
<small>[ November 12, 2002, 06:25 PM: Message edited by: thefritz1 ]</small>
Re: p0300 Misfire Code Urgent Help! log your plugs with atap and see if a cyl is misfiring. You probably have bad plugs or a loose wire??
if you're getting a misfire code then you have a misfire that needs to be fixed <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
if you're getting a misfire code then you have a misfire that needs to be fixed <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
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Re: p0300 Misfire Code Urgent Help! Sorry to be a clown but could you tell me how to log it using ATAP. I only use atap for air/fuel stuff.
Thanks.
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 98TAauto:
<strong>log your plugs with atap and see if a cyl is misfiring. You probably have bad plugs or a loose wire??
if you're getting a misfire code then you have a misfire that needs to be fixed <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">
Thanks.
</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by 98TAauto:
<strong>log your plugs with atap and see if a cyl is misfiring. You probably have bad plugs or a loose wire??
if you're getting a misfire code then you have a misfire that needs to be fixed <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">
Re: p0300 Misfire Code Urgent Help! Check the Atap (show all) and bring up each cylinder onto the table--misfire cyl, 1 -misfire cyl 2- ect. It will give you a misfire count on the bad cylinder.
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From: LA New Orleans Marrero
Re: p0300 Misfire Code Urgent Help! ok here goes to make a long story short i have a PO 300 also only diff is i was not getting that coad any other time. after i put on my ASP pulleys crank and Alt on she poped that coad?????????????? i dont think anything's wrong with the plug's or wire's i put the 10.4 MM wire's on with the NGK's about 8 or 9 month's agaio. and i hade it checked plenty of time's i think it's the pulleys. sound weard to you gye's??????????????? lot'a of other's was saying the same thing. something about the crank's not turning the same speed as the camshaft. it's not missfiring bad at all you can't even tell. anybody got any good answers??????????? i was thinking about putting the stock one's back on??? <img border="0" alt="[Firebird]" title="" src="graemlins/formula.gif" />
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From: Maple Shade
Re: p0300 Misfire Code Urgent Help! Try checking your engine sen fuse under the hood. If is blown the car will idle like crap and set off misfire dtcs. What if u clean the injectors.
gm injectors get dirty fast!!
gm injectors get dirty fast!!
Re: p0300 Misfire Code Urgent Help! I ran into this on a friends car. Slight stumble at idle and under low RPM load. I checked it with autotap and every cylinder is misfiring! All is fine at WOT and mild accelleration, but at idle this happens. No SES lights, but the P0300 code was in the computer. Any suggestions?
John
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Re: p0300 Misfire Code Urgent Help! </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Blue Fire:
<strong>ok here goes to make a long story short i have a PO 300 also only diff is i was not getting that coad any other time. after i put on my ASP pulleys crank and Alt on she poped that coad?????????????? i dont think anything's wrong with the plug's or wire's i put the 10.4 MM wire's on with the NGK's about 8 or 9 month's agaio. and i hade it checked plenty of time's i think it's the pulleys. sound weard to you gye's??????????????? lot'a of other's was saying the same thing. something about the crank's not turning the same speed as the camshaft. it's not missfiring bad at all you can't even tell. anybody got any good answers??????????? i was thinking about putting the stock one's back on??? <img border="0" alt="[Firebird]" title="" src="graemlins/formula.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">3rd party pulley or dampers can put the crank out of balance ( esp cheap ones) and since the crank position sensor looks for rotational differences the unbalanced pulley will keep the crank out of wack and sensor tripping false misfires.
These dampers MUST be balanced to crank correctly.
<strong>ok here goes to make a long story short i have a PO 300 also only diff is i was not getting that coad any other time. after i put on my ASP pulleys crank and Alt on she poped that coad?????????????? i dont think anything's wrong with the plug's or wire's i put the 10.4 MM wire's on with the NGK's about 8 or 9 month's agaio. and i hade it checked plenty of time's i think it's the pulleys. sound weard to you gye's??????????????? lot'a of other's was saying the same thing. something about the crank's not turning the same speed as the camshaft. it's not missfiring bad at all you can't even tell. anybody got any good answers??????????? i was thinking about putting the stock one's back on??? <img border="0" alt="[Firebird]" title="" src="graemlins/formula.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">3rd party pulley or dampers can put the crank out of balance ( esp cheap ones) and since the crank position sensor looks for rotational differences the unbalanced pulley will keep the crank out of wack and sensor tripping false misfires.
These dampers MUST be balanced to crank correctly.
Re: p0300 Misfire Code Urgent Help! Sounds like you both need to have the crankshaft postion relearned. Resetting the pcm or reprogramming it requires the relearn. The new balancer could effect crankshaft position learned status. You will have to have it relearned by the dealer or by somebody that has a tech II.