GM TBI Injector size, color and part numbers

[zjlarson]

I see conflicting data on the 5235206 Orange/Black. The truck 5.7 injectors, I am seeing fuel rates at 55 pph versus this forums listing of 61 pph. Is there an error.

[dave w]

I see conflicting data on the 5235206 Orange/Black. The truck 5.7 injectors, I am seeing fuel rates at 55 pph versus this forums listing of 61 pph. Is there an error.

This forum has the correct flow for the 5235206 injector, 61 pph. When doing the math for Base Pulse Width (BPW), it's very clear that 61 pph is the correct flow for injector 5235206.

dave w

[kilohertz]

I have a 4.3 TBI unit that has 2 different injectors in it. I have searched for a few hours and can't find any flow data for them. Do any of you fine fellows have any data for these please and thanks? I know 4.3L should use 45pph injectors but they used slightly different left/right to compensate for manifold dis-symmetry or some such reason.

5235134
5235342

Thanks!

[dave w]

Maybe this injector supplier will help with flow rates?

https://www.motormanfuelinjection.co...r-5235134.html

https://www.motormanfuelinjection.co...r-5235342.html

There is the option to have Mr. Injector service the injectors ($18.00 each): https://www.mrinjectorparts.com/

Perhaps Mr. Injector will share the flow rates?

dave w

[tayto]

i recall they are different flow rates, what they are I couldn't tell you. i would try to find another one with the same p/n. 5235203 is same as 5235134 FWIW.

I might have some 4.3l injectors if you're interested. I know for sure I have a set or two of 305 injectors as well. I recommend getting them tested and cleaned, there's a place in port kells that does them.

[tayto]

Here's some info from diy-efi.org:

Mis-Matched TBI injectors
The Throttle Body Injection (TBI) assembly installed on the 1987 4.3L light duty truck engine uses injectors with DIFFERENT flow rates in each throttle bore for improved emission control. The TBI units involved are model numbers 17087090 and 17087162. If the injectors are removed for any reason, care must be taken to make sure they are installed in their proper location.
INJECTOR LOCATION INFORMATION

Throttle Lever Side Bore COLOR-CODED ORANGE AND GREEN

New service package Part Number 17111928
Remanufactured equivalent Part Number 17111930
TPS Side Bore COLOR-CODED PINK AND BROWN
New service package Part Number 17111929
Remanufactured equivalent Part Number 17111931

[kilohertz]

Thanks guys, appreciate the info.

Tayto, if you are referencing Port Kells you must be in the lower mainland, thanks for the offer. If I can't find anything local, I will contact you.

I found out tonight that my fuel pump is only developing 10 PSI, so I need to get a new one for continued testing and tuning. I cranked up the reg spring but the pressure stayed at 10..ha.

Dave I will check out the links, thanks for that. If I learn anything, I will post it here for others.

Cheers!

[tayto]

NW Fuel Injection Service in port kells is the only place locally i've found. look at a EP381 (vortec) or EP241 (TPI) pumps as an upgrade.