Low RPM Misfire/Hesitation Issue
02-01-2012, 12:13 PM
#21
On The Tree
Thread Starter
Join Date: Sep 2006
Location: San Jose, CA
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
I was constantly tripping a P0300 code and it turns out that running dual springs for the valves can cause symptoms like a large cam.
The solution is to "open up" the miss fire tables.
In your case, I think you have a throttle body problem as you can get the problem to appear if you throttle it slowly.
You don't say whether your motor is modded or not.
The solution is to "open up" the miss fire tables.
In your case, I think you have a throttle body problem as you can get the problem to appear if you throttle it slowly.
You don't say whether your motor is modded or not.
What do you mean by throttle body problem? Before I replaced the plugs and wires, I did find the air tube running to the throttle body was not tightened 100% and was loose. I re-tightened it. Doubt anything got in there though.
02-01-2012, 12:48 PM
#23
On The Tree
Thread Starter
Join Date: Sep 2006
Location: San Jose, CA
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
Thank you for the explanation. Any way I can test the throttle body motor to see if it isn't operating correctly? Or do I need the GM hand held diagnostic tool?
02-01-2012, 12:49 PM
#24
TECH Fanatic
iTrader: (7)
Join Date: Dec 2011
Location: Tampa-ish
Posts: 1,003
Likes: 0
Received 0 Likes
on
0 Posts
Bad TPS?
Either way Kurlee, all we can do is speculate and give some suggestions and ideas, but in the end, you're going to have to have someone look at it and diagnose it.
02-01-2012, 12:58 PM
#27
On The Tree
Thread Starter
Join Date: Sep 2006
Location: San Jose, CA
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
02-01-2012, 11:31 PM
#28
If you can get it on a good scanner you will be able to view the TPS signal live, that would allow you to view the voltage the computer is seeing from the TPS during wot or part throttle conditions...that's the best way I have found to rule out the throttle body unit, I'm pretty sure iac and TPS are all integrated in the tb unit...def try disconnecting egr like the other guy said that will let you know if ur egr solenoid is bad
02-02-2012, 08:42 AM
#29
TECH Resident
Join Date: Nov 2011
Location: NJ
Posts: 812
Likes: 0
Received 0 Likes
on
0 Posts
you need to eliminate the simple things first.
Last edited by 1ltcap; 02-02-2012 at 08:54 AM.
02-15-2012, 06:28 PM
#30
On The Tree
Thread Starter
Join Date: Sep 2006
Location: San Jose, CA
Posts: 182
Likes: 0
Received 0 Likes
on
0 Posts
Brought my car to the shop. The mechanic called me with the diagnosis. Two faulty coils. #7 and #4. He confirmed it with his GM handheld. He also checked fuel pressure among other things and it was fine.
When I called to confirm that the car was done, the mechanic told me that when he replaced coil # 7, his hand held reader showed no more faults. Apparently #7 coil was reverberatting causing the other to coil to look bad. So he only charged me for one coil and labor.
Car runs perfect now, so I'm happy.
When I called to confirm that the car was done, the mechanic told me that when he replaced coil # 7, his hand held reader showed no more faults. Apparently #7 coil was reverberatting causing the other to coil to look bad. So he only charged me for one coil and labor.
Car runs perfect now, so I'm happy.
