73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: DrDaryl on November 25, 2012, 09:01:47 PM

Title: TBI swap (I miss my quadrajet)
Post by: DrDaryl on November 25, 2012, 09:01:47 PM

I decided to try the TBI swap and after a lot of research decided to pull the throttle body/harness/etc from a 1987 R10 (350, 700R4) at the local salvage yard.  I opted to use an adapter plate to mount the throttle body to my stock spreadbore intake, and I used an inline Walbro TBI pump.  I did not use EGR as there was no way to connect it due to the adapter plate in the way.  My engine is a crate 350 absolutely stock.  She cranked right up but as it warms up begins to stumble, backfire, and dies.
I am getting fuel from the injectors, the timing is close (about 6 BTDC, but dies if I unplug the tan/black wire that is disconnected to set the timing).  I probably won't get to work on it until next weekend, thought I'd get some input on things to check.  Thanks

Title: Re: TBI swap (I miss my quadrajet)
Post by: VileZambonie on November 25, 2012, 11:03:26 PM

Set the timing correctly and make sure the adapter plate is not leaking.

Sent from my EVO using Tapatalk 2

Title: Re: TBI swap (I miss my quadrajet)
Post by: Captkaos on November 30, 2012, 07:44:18 PM

Did you find anything? 

Title: Re: TBI swap (I miss my quadrajet)
Post by: DrDaryl on December 03, 2012, 02:21:25 PM

I'm still working on it; I did have a bad idle air control and and replacing that made a big improvement but something is wrong with the timing on the engine; I'm having a friend come over Saturday to help me double check the distributor and plug wires.
Thanks