2000 gt keeps throwing codes p300 p301 p302
#1
Mach 1 Member
Thread Starter
Join Date: October 14, 2010
Location: saskatoon
Posts: 722
Likes: 0
Received 0 Likes
on
0 Posts
2000 gt keeps throwing codes p300 p301 p302
K punched a hole in cylinder 2,installed new head,re-installed everything EXACTLY as it came off. I went as far as to take pictures of areas I may have problems with. Car now has no power,has a noticeable miss. I have replaced every coil pack and alternated with known functioning packs,wiring harness has no kinks or pinches. There isn't a vacuum leak as I have checked every vacuum line twice. Swapped plugs with known good plugs. I don't know what to check next. This car would rip rubber thru 3 gears now I can barely get a chirp with a 1st gear dump. What do I do next
#3
Mach 1 Member
Thread Starter
Join Date: October 14, 2010
Location: saskatoon
Posts: 722
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by AlsCobra
Get a compression test set bro. Check compression first man. There may be a valve leaking by.
#4
A Man Just Needs Some....
Kill the ignition source and the fuel. Spin it with the gauge in a cylinder and just compare. Shouldn't have to be running to test it. This test alone should give answers enough to go from.
#6
Swamp Donkey Man Cans
Join Date: August 20, 2007
Location: Massachusetts
Posts: 4,352
Likes: 0
Received 2 Likes
on
2 Posts
Make sure you hold the throttle wide open when you do the test. You need to have an unrestricted flow of air to the cyl to get a true reading. 3-4 revolutions of the engine should be enough to.
#8
Swamp Donkey Man Cans
Join Date: August 20, 2007
Location: Massachusetts
Posts: 4,352
Likes: 0
Received 2 Likes
on
2 Posts
Oh but it will, a closed throttle plate will restrict air flow to the cylinders and not allow as much into the cylinder as when it is wide open. The more air in the cyl the higher the pressue. Let me put it this way, does the same amount of air enter the cylinder at idle as at WOT?
#9
A Man Just Needs Some....
Originally Posted by 07S197
Oh but it will, a closed throttle plate will restrict air flow to the cylinders and not allow as much into the cylinder as when it is wide open. The more air in the cyl the higher the pressue. Let me put it this way, does the same amount of air enter the cylinder at idle as at WOT?
#10
Swamp Donkey Man Cans
Join Date: August 20, 2007
Location: Massachusetts
Posts: 4,352
Likes: 0
Received 2 Likes
on
2 Posts
Agreed, if you don't know the spec. range then it really doesn't matter. You can compare good cylinder to bad ones and if they are all similar than it can be assumed you are good. However if you know the spec range for a 2000 4.6 is say 150-180psi and you get 130 with the throttle closed then you may believe you have an issue where with it open you may see 160 and then the cyl would be considered healthy depending on engine mileage etc.
As a side note you should also have all spark plugs removed... you want the engine spinning at the highest RPM possiable
Last edited by 07S197; 5/13/11 at 02:38 PM.
#15
A Man Just Needs Some....
Originally Posted by Everett
K 162 in cylinders 1 and 2 173 in 3 and 4. Finishing a beer and gonna check the other side. I am thinking it's gotta be some retarded sensor
#16
Post *****
Join Date: December 14, 2007
Location: State of Jefferson Mountains USA
Posts: 20,005
Likes: 0
Received 4 Likes
on
4 Posts
Do you know what the codes mean?
Cam & crank sensors can go bad. That could trigger an error code, but the miss implies something more than a bad/unplugged sensor.
Cam & crank sensors can go bad. That could trigger an error code, but the miss implies something more than a bad/unplugged sensor.
#17
Mach 1 Member
Thread Starter
Join Date: October 14, 2010
Location: saskatoon
Posts: 722
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by cdynaco
Do you know what the codes mean?
Cam & crank sensors can go bad. That could trigger an error code, but the miss implies something more than a bad/unplugged sensor.
Cam & crank sensors can go bad. That could trigger an error code, but the miss implies something more than a bad/unplugged sensor.
#18
Mach 1 Member
Thread Starter
Join Date: October 14, 2010
Location: saskatoon
Posts: 722
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by cdynaco
Beat me to the punch.
Cam timing one tooth off...
#19
Post *****
Join Date: December 14, 2007
Location: State of Jefferson Mountains USA
Posts: 20,005
Likes: 0
Received 4 Likes
on
4 Posts
Ya...p300 is random misfire,p301 is misfire in cylinder 1 p302 is misfire in cylinder 2. Sometimes p304 pops up too. I checked the other bank and 5-8 are between 170-175. So I am going to eliminate compression as a problem. And I rechecked 1 and 2 and they are just under 170. Next idea
#20
Mach 1 Member
Thread Starter
Join Date: October 14, 2010
Location: saskatoon
Posts: 722
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by cdynaco
I'm sticking with cam timing. The engine does run which shows fuel and fire are good.