99 chevy 1 ton 350 no power (Page 1/2)
86soon3.4 OCT 31, 12:33 PM
I have a 1 ton Chevy two wheel drive with a 350 Vortec in it. The problem I am having is it has no power when hard acceleration sometimes.
It does not miss either. It has good fuel pressure (55 running and 60 K.O.E.O.) Checked flow and fills a can pretty quickly.
Engine vacuum holds steady at 18 In. dips down and recovers on acceleration. Exhaust is not plugged up and does not rattle.
No CEL. Has a new distributor. (gear wore out on old one) engine was timed with scan tool plugged in. Has minimal
timing chain wear. (rocked harmonic balancer back and forth, watched rotor)

I am stumped....My next step is to change the fuel filter which is not that old....

I am beginning to think the injector spider is my problem.

any thoughts?

Steve
E.Furgal OCT 31, 05:23 PM
ziggie was a spider..
carnut122 OCT 31, 06:12 PM
Sounds like you have the easy stuff covered. It could be the FI spider.
86soon3.4 NOV 01, 04:47 PM
Bump....anybody???
RWDPLZ NOV 02, 08:27 PM
Did they use that stupid CPI spider injection design on 350's too? I thought that was just on some mid-90's 4.3's. You could write a book on what a horrible POS that system was.

[This message has been edited by RWDPLZ (edited 11-02-2012).]

weaselbeak NOV 02, 09:02 PM
X2
86soon3.4 NOV 07, 08:57 PM
I replaced the spider injectors and we now have power!!!


Steve
Raydar NOV 09, 01:37 AM
The 4.3 service part actually replaces the CPI and the poppet valves with 6 individual injectors.
Is the V8 similar?
86soon3.4 NOV 14, 08:57 PM

quote
Originally posted by 86soon3.4:

I replaced the spider injectors and we now have power!!!


Steve



Well this did not fix the problem...BUT I did find the problem!!

I found someone with the same truck to try some sensors.
The first one I tried was the MAF sensor and it came alive.

So the cure was the Mass Airflow Sensor.

Steve
Kekipi DEC 08, 03:07 AM

quote
Originally posted by Raydar:

The 4.3 service part actually replaces the CPI and the poppet valves with 6 individual injectors.
Is the V8 similar?



Yes. I use to get them from The Injection Guru in Indianapolis.