3500 4x4

ply48 · 06-29-2008, 08:45 AM

my truxk engine idles up and down. I've changed the tps, iac, fuel pessure reg., injectors, and the egr. It lacks power. If i disconnect the air line from the back of the engine it runs smooth, but still lacks power. I have no clue what coud be wrong.

Case 7230 · 06-30-2008, 10:02 AM

What year? What engine? Have you checked for plugged cat?

ply48 · 06-30-2008, 05:05 PM

89' old body style and i have the cat removed. have changed the o2 sensor

ply48 · 06-30-2008, 05:08 PM

its a 350 cu

smokensteve · 06-30-2008, 08:14 PM

probably your TBI intake manifold gasket...they dry out and get sucked into the engine,,, sometimes

..anyway,,, it is probably due to be changed, this would cause all sort of idle / vacume problems...very common problem

ply48 · 07-04-2008, 12:17 PM

I've changed that too.

jimbo543 · 07-04-2008, 02:03 PM

timing? read your white tag on the rad shroud, tells you how/spec.
unplug wire conn on pass firewall under plastic cover, i set timing at 2* advance.

06-29-2008, 08:45 AM	#1 (permalink)
ply48 Junior Member Join Date: Jun 2008 Posts: 4	3500 4x4 my truxk engine idles up and down. I've changed the tps, iac, fuel pessure reg., injectors, and the egr. It lacks power. If i disconnect the air line from the back of the engine it runs smooth, but still lacks power. I have no clue what coud be wrong.

06-30-2008, 08:14 PM	#5 (permalink)
smokensteve Senior Member Join Date: Jan 2007 Location: North Vancouver BC Posts: 85	probably your TBI intake manifold gasket...they dry out and get sucked into the engine,,, sometimes..anyway,,, it is probably due to be changed, this would cause all sort of idle / vacume problems...very common problem

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06-30-2008, 10:02 AM	#2 (permalink)
Case 7230 Senior Member Join Date: Dec 2007 Posts: 190	What year? What engine? Have you checked for plugged cat?

06-30-2008, 05:05 PM	#3 (permalink)
ply48 Junior Member Join Date: Jun 2008 Posts: 4	89' old body style and i have the cat removed. have changed the o2 sensor

06-30-2008, 05:08 PM	#4 (permalink)
ply48 Junior Member Join Date: Jun 2008 Posts: 4	its a 350 cu

07-04-2008, 12:17 PM	#6 (permalink)
ply48 Junior Member Join Date: Jun 2008 Posts: 4	I've changed that too.

07-04-2008, 02:03 PM	#7 (permalink)
jimbo543 Senior Member Join Date: Sep 2007 Location: MN Posts: 173	timing? read your white tag on the rad shroud, tells you how/spec. unplug wire conn on pass firewall under plastic cover, i set timing at 2* advance.