Northstar Engines and System Technical Discussion Discussion, Injector Alternatives in Cadillac Engine Discussion; The injectors on my 93 Allante N* are super expensive so I was wondering if there's a lower cost alternative ...
The injectors on my 93 Allante N* are super expensive so I was wondering if there's a lower cost alternative such as injectors from another brand of car?
The engine has 64k miles but I have not been able fix the hard warm start problems so I'm thinking it's probably injectors.
Easy cold start
Easy warm start if started immediately after shutdown
Excessive cranking if engine sits for 15 minutes to 1 hour
Raw fuel smell from exhaust after excessive cranking
Poor city fuel economy (9-11 mpg)
Poor fuel economy at speeds under 80 mph
What I've done so far:
New AC Delco FPR
Regapped original spark plugs
New fuel filter
Ran Lucas fuel treatment through several tanks of fuel
Performed a fuel pressure test and got the following:
Cold engine - 0 psi
key on - 40 psi
5 minutes - 36 psi
25 minutes - 30 psi
105 minutes - 20 psi
Very slim chance that the new unit is faulty. To test it, do a running engine fuel pressure check with a gauge. Somewhere close to 44 psi. If not, maybe fuel pump. (Look up that fuel pressure spec - some engines vary.)
The specs according to my manual are between 40-50 psi.
When I turn on the key, the pressure gauge goes up to 46 psi and settles down to 40 psi. When I start the engine, the gauge settles down to about 38.5 psi. If I rev the engine, the gauge will spike up to about 45 psi. I wonder if it's possible that a weak fuel pump might be causing hard starts after 15 - 60 minutes of sitting.
Will they fit and will the plugs work? It looks like there's a standard.
Yeah those are them, except back when I got them they were Yellow.
Yeah the Plug ends are the Same, nozzle spray pattern is differnent and the Caddy ones on my 97 had a plastic Nozzle cap on them and what looked like only one Spray hole, the LT1 ones don't have this plastic extended nozzle cap, and have a mulit spray nozzle , but like I said car ran great!, mine came outta my 96 trans-am, so I bought the Injector o-ring kit for the caddy and changed the upper and lowers just cause the caddy on's looked a little thicker, it was like 8 bucks for the bag of them. I don't know if you're car had the recall for the plastic fuel rail, my year did so I got the S/S one for free which was a much better fit.
I didn't reinstall the CLips to hold the injectors to the Fuel rails, I never do, if you do or don't just preasureize the system before starting it and check for leaks