Hi,

i have a TPI system off an 87 GTA that i am getting new runners for, what will happen if i remove the cold start injector and block it off? will the car be pissed? any input is greatly appreciated. thanks

 

Pretty shure you can just eliminate it,Dont forget to cap the fuel rail...........

 

'89 is supposed to be the magic year in which the all-knowing GM engineers discovered that they only need eight injectors. So what people are saying is, get the '89 PROM image, put it in your ECM, remove the coldstart valve, and you're good to go. I'd like to test this on my '86, but nobody has the '89 image to share, so it seems.

I heard they're only $30 from the dealer, maybe I'll just buy one and share it with you guys.

 

The cold start injector is kinda like a choke on a carburetor. It feeds extra fuel for I believe about 8 seconds during cranking. You can take it out, but it will result in a hard starting condition when the motor is less than like 150*. The definate upgrade would be to go to the 89 programing (it was the only non CSI/w MAF) and keep the closed loop, and cold idle code the same, just use your existing WOT code.

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Why did they dump that cold start injector? Was there a real reason, or just for kicks?

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-Tom P (Hot rodded 1986 Firebird 2.8l) from http://www.f-body.net/mailbag/3rd/3rd_mailbag.html message boards

 

I remember back in 88 there was a guy at the track who had a 87 iroc and was using the 9th injector as enrichment for his nitrous system. I dont know how he was triggering it, but it was pretty wild for the time. There were no nos steups for these cars back then.

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87z 383,afr 190's, crane hyd roller(224/230-.509/.528,112 sep),Ported and polished mini ram, 24lb inj, 3.42 gears, strange 12 bolt, tremec 5spd, , 1,3/4" slp headers.(stock 305 hypercrap chip), other stealth goodies.
Runs 14's all day long.

 

My guess as to why they eliminated it is because it probably cost more to include it than to not include it! Cost is king, you know.. Whoever came up with that idea probably became employee of the year!

Other benefits to NOT having the 9th injector would probably be easier assembly, more reliable product, etc..

 

so you are putting a TPI engine in an RX-7? cool

 

Check your email, maybe I can help.

Jake -Not to be confused with my namesake.



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1986 Corvette Coupe, 415 CID, Edelbrock 6073s, ZZ9

 

Why do you want to get rid of it? Space constraints? If it ain't broke, don't fix it.



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87 IROC-Z, 5.7, auto, 3.27, leather, !cat, Holley fpr, K&N'S, SLP 1-3/4" Jet-Hot coated headers, SLP .218/.224
.495/.502 cam, Comp 1.5 roller tip rockers, $uperPITAram, Edelbrock lower intake, Holley 52mm tb, Dynomax\
Flowmaster catback Coming Soon (?)- Fasttrack/Accell DFI

1989 Pontiac 20th Anniversary Turbo Trans Am - 160,000 miles, K&N filter

SOLD ->91 Z28, 5.7, 3.23, Ported Plenum, Accel runners & lower intake, Accel distributor module, !dual cats, POS Edelbrock catback, K&N'S, ram air, tb airfoil, !tb coolant