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11-27-2005, 06:22 PM #1smyrnamanGuest
engine misfires under full throttle
My 2001 Ram Air runs great except under full throttle, It surges and misses very badly under full throttle. I checked for codes and it does not set any codes and the check engine light is not on. Anyone have any ideas the car has about 80000 miles on it
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11-27-2005, 06:26 PM #2
What is your RPM's when it starts missing?
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11-27-2005, 06:33 PM #3smyrnamanGuest
It would appear that it is just a case of heavy throttle or full throttle, I can cruise at 2500 in high gear and it runs great but if I put my foot in it it misses and surges badly
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11-27-2005, 06:45 PM #4
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Collectors Edition Yellow- 2002 Pontiac Trans AM WS6
AHHHH sounds familiar...... I had the same problem man.. Check ALL the ignition wires i'll bet one is alittle loose!!! That was the SAME problem for me and the ignition wire for cylinder 4 was slightly loose and was jumping a spark just enough to make connection but not enough to throw a code.. Give it a shot!!!
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11-27-2005, 06:47 PM #5smyrnamanGuest
Thanks I will check, if anyone else has had a similar problem please come on in. I did change the plugs about 3000 miles ago.
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11-27-2005, 06:54 PM #6redls1birdGuest
what do you mean by surging? is it an auto or manual? technically it cant "surge" because of the way the drivetrain is connected. the only real way to effect the rpms is the throttle..
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11-27-2005, 06:57 PM #7smyrnamanGuest
It acts like it is starved for fuel and then regains it self for a moment then it starts all over again. Similar to turning your key off and on quickly.
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11-27-2005, 07:11 PM #802 Blk T/A WS6Guest
1 of your plugs is loose causing it to arch when you lay into it. happen to me once check your plugs
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11-27-2005, 07:20 PM #9
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Collectors Edition Yellow- 2002 Pontiac Trans AM WS6
Originally Posted by 02 Blk T/A WS6
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11-27-2005, 07:26 PM #1002 Blk T/A WS6GuestOriginally Posted by NeeD4SpeeD
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11-27-2005, 07:29 PM #11
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Collectors Edition Yellow- 2002 Pontiac Trans AM WS6
Originally Posted by 02 Blk T/A WS6
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11-27-2005, 07:40 PM #1299PontTAGuestOriginally Posted by smyrnaman
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11-27-2005, 07:53 PM #13smyrnamanGuest
Thanks for all the input everyone, I will tackle this first thing on Monday.
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11-27-2005, 07:58 PM #14
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Collectors Edition Yellow- 2002 Pontiac Trans AM WS6
Originally Posted by smyrnaman
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11-28-2005, 06:35 PM #15smyrnamanGuest
Tried it all and it still is missing at full throttle, the car runs great at all other throttle conditions. How would the O2 sensor affect full throttle?
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11-28-2005, 07:26 PM #1699PontTAGuest
they won't.......next thing i would do is no 1.check fuel rail and lines for rust contamination, no 2 check fuel pressure.read this http://service.gm.com/gmtechlink/ima...me.html#story7
its possible the screens are partially blocked in the injectors.CHECK THE fuel pressure with a gauge..its important to know what you are working with.My 99's fuel rail was so badly rusted it blocked most of the screens with rust...car ran terrible.Before it got it really bad the car would SURGE as you accelerated and MISS at WOT....then i put some fuel system cleaner in it....that finished it completely because it lossened all the rust and totally blocks ALL the injectors.Last edited by 99PontTA; 11-28-2005 at 07:32 PM.
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