The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - What did you do to your truck today? Chapter II

**Steeveedee** · 11-05-2014, 11:34 PM

I've had a high power bogging situation for awhile now, but haven't really had time to address it until today (retired last Friday!). Turns out that the plastic cam that lifts the secondary jets when the secondary air valve opens was broken. I found two pieces in the channel between the secondary bores. I guess the rest went out the tail pipe. Air valve opens with no enrichment, truck slows down on full throttle. Lame. It'll be a ton quicker tomorrow.

It up shifts too early, as well. Guess I'll have to replace/adjust the vacuum modulator. Second gear scratch for sure.

11-05-2014, 11:34 PM	#1314
Steeveedee Who Changed This? Join Date: Jan 2013 Location: Simi Valley, CA Posts: 10,081	Re: What did you do to your truck today? Chapter II I've had a high power bogging situation for awhile now, but haven't really had time to address it until today (retired last Friday!). Turns out that the plastic cam that lifts the secondary jets when the secondary air valve opens was broken. I found two pieces in the channel between the secondary bores. I guess the rest went out the tail pipe. Air valve opens with no enrichment, truck slows down on full throttle. Lame. It'll be a ton quicker tomorrow. It up shifts too early, as well. Guess I'll have to replace/adjust the vacuum modulator. Second gear scratch for sure. __________________ ~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA Last edited by Steeveedee; 11-05-2014 at 11:41 PM.