Ive had..alot of problem with my K3500 Silverado, have yet to tag it..in 10 months of ownership, ive got 2-3 other trucks I can drive daily so its been a project...
First things first...its a 151K mile, K3500, with the TBI 454...
My problems at first were, it refused to idle down under 1100...I replaced...
TBI gaskets
regulator
TPS, IAC, MAP, CTS....and a new ECM, and EPROM with stock tune, except lower idle values, I set the timign to 4*...and set base idle as low as it would go...I also replaced most all the fuel lines, and PCV valve.
This got it lower...around 1000rpms in park when HOT....BUT...then I had a bad miss on at least 2 cylinders...pulling the plugs revealed 3 and 5 were white...very lean.
So I replaced the intake gaskets..half the bolts were backed out...Got that together, ALSO replaced 8 plugs, 8 wires, coil, module, cap, rotor button, rebuilt TBI unit, resealed TBI base, removed the high idle dashpot...and replaced the remainder of the vac lines...
Idle is smooth...725 in gear, 825 in park....
SO..I drove it a little bit..to feel it out, mainly doing idling, crusing, kicking it down a gear on hills...it felt fine. This afternoon I was warming it up in the driveway, and it felt good...I decided to punch it wide open one time..and it stumbled...so I did it again, and I found that when floored....matted..it wont rev up past about 2500. If I go to like 3/4 throttle...or where you can feel its right before "forced kickdown"...it revs to 4500 with no problems. If I floor it..it stumbles....and goes to about 2500....and will sit there and BUCK...in park.
When I does this, (was getting dark) I cn smell a strong strong fuel odor....I cant tell if its something like...TPS is bad and cutting out fuel at WOT...or dumping fuel at WOT...or the spark is getting cut???
I will do some testing tomorrow if its not storming....but this is so strange....
Does it cold..hot, warm...driving, parked....if you take the pedal to WOT...its not going to rev up. Also, sometiems if I let it do it, and lift off to idle...is will idle fine..other times it will just shut off...
http://s97.photobucket.com/user/RED-85-Z51/media/CAM00245_zpsc4b2febc.mp4.html
It actually sounds really good..the exhaust is a 3" single in catless Y pipe int oa single in Dual out flowmaster 40, and out the back in duals....the video makes it sound like all the valves are about to fly out the hood..haha.
First things first...its a 151K mile, K3500, with the TBI 454...
My problems at first were, it refused to idle down under 1100...I replaced...
TBI gaskets
regulator
TPS, IAC, MAP, CTS....and a new ECM, and EPROM with stock tune, except lower idle values, I set the timign to 4*...and set base idle as low as it would go...I also replaced most all the fuel lines, and PCV valve.
This got it lower...around 1000rpms in park when HOT....BUT...then I had a bad miss on at least 2 cylinders...pulling the plugs revealed 3 and 5 were white...very lean.
So I replaced the intake gaskets..half the bolts were backed out...Got that together, ALSO replaced 8 plugs, 8 wires, coil, module, cap, rotor button, rebuilt TBI unit, resealed TBI base, removed the high idle dashpot...and replaced the remainder of the vac lines...
Idle is smooth...725 in gear, 825 in park....
SO..I drove it a little bit..to feel it out, mainly doing idling, crusing, kicking it down a gear on hills...it felt fine. This afternoon I was warming it up in the driveway, and it felt good...I decided to punch it wide open one time..and it stumbled...so I did it again, and I found that when floored....matted..it wont rev up past about 2500. If I go to like 3/4 throttle...or where you can feel its right before "forced kickdown"...it revs to 4500 with no problems. If I floor it..it stumbles....and goes to about 2500....and will sit there and BUCK...in park.
When I does this, (was getting dark) I cn smell a strong strong fuel odor....I cant tell if its something like...TPS is bad and cutting out fuel at WOT...or dumping fuel at WOT...or the spark is getting cut???
I will do some testing tomorrow if its not storming....but this is so strange....
Does it cold..hot, warm...driving, parked....if you take the pedal to WOT...its not going to rev up. Also, sometiems if I let it do it, and lift off to idle...is will idle fine..other times it will just shut off...
http://s97.photobucket.com/user/RED-85-Z51/media/CAM00245_zpsc4b2febc.mp4.html
It actually sounds really good..the exhaust is a 3" single in catless Y pipe int oa single in Dual out flowmaster 40, and out the back in duals....the video makes it sound like all the valves are about to fly out the hood..haha.
