Hey all, ill get right to it. 350 tpi 60 on the motor 250 on the body Bosch 3 injectors with maybe 5k on them. Did an intake manifold gasket swap and some relooming of the harness while it was apart and now 4 of my 8 cylinders are dead. The dead ones are all on the drivers side and they are getting spark, air is a givin, and they have compression but I think my injectors aren't firing. The plugs have 12v to them and the injectors ohm out to spec but they aren't firing I don't think. Is there any way to test whether or not they are actually opening an closing? And my fuel pressure is 43 all day so that's not it either. And the timing is correct also. Any ideas? I really need this car for work this week. It's bad enough I busted a ttop the other day and now this.... It's like poring salt in the wound lol. Thanks guys!

 

Bought a noid light and my injectors aren't pulsing but they all have 12volts to them which rules out a short so I bought an ecu and still no pulse. How is that even possible?

 

Now it won't start at all and both injectors have power and neither will pulse.... What the eff ????

 

A few things to check, the ecm ground behind the pass cylinder head, see if you have spark. if no spark sounds like a icm or pickup coil.

 

Ill double check the ground but I was nowhere near there during the gasket swap and yea I've got spark for sure. To e honest I'm pricing out a carb swap now and I'm going that route I'm pretty sure. Tpi is such a cool vintage style intake and it looks awesome but just to much maintenance for me.

 

If u think TPI is bad, wait till the carb goes on..
Bottom line is, these cars are old, they will need some new parts now and then.
I for 1 will never own another carbed car or truck.

 

Carb is a bad four letter word lol, you can check to see if the ecm is powered bye jumping the aldl a to b and see if you get a code 12. Other than the ecm ground, or ecm power or the other half of the icm not sending DRP to the ecm are the only possibilities unless a injector is shorted and shutting down the injector driver. The only other thing that comes to mind is vats but since you have a 88 it should not have vats.

 

Sorry guys, already made the switch. Sold the tpi and bought a carb set up. For better or worse I'm in it now. I think I'll pick up carb better then tpi I'm not a computers kinda guy. Never have been. My tpi just gives me too much trouble and I need some more reliability. I'd rather it run rich or lean all the time then run perfectly half the time which seems to be the case with my tpi. We could go on and on about which is better but there is no arguing carbs are the more simple of the two. They both may be hard to get running perfect but ill take my chances with the carb. And believe me I know these cars need maintenance, just replaced the whole clutch assembly a few weeks ago, intake manifold gasket, fixed a ttop leak, fuel pump.... The list goes on. I'm just ready for a change. An old school change.

 

I'm hearing a song by Queen, Another one bits the dust.. lol
Good luck with her

 

Lol so true. I'm waving the white flag on this efi stuff. I still believe its the way to go in the long run but I just wanna do it right yanno? Maybe if I get like a gm350 crate motor ill go with a nice stealth ram and an engine management system that's not 26 years old. Ill come back to it eventually...

 

This is where I'm headed next. Pricey but nice.
http://www.eficonnection.com/eficonnection/default.aspx

 

I feel for ya bro, and don't blame ya! When my son drove the 85 Z in HS, this Z racked up $5k worth of wrecker and repair bills back in the 90's. I was hell bent on learning how to understand and work on that same 85 TPI that I have. I finally figured this bitch out and I collected a few extra parts to keep her TPI. A lot of thanks goes to the people here on TGO over the years too.

 

Sounded like you had a wiring issue and not a parts problem. Just putting 2 and 2 together since you said you did some relooming of the harness when you did intake gaskets. The injectors are batch fired, so 4 on one side fire at the same time and the other 4 on the other side fire at the same time. You probably broke the wire coming from the ecm that fires the driver side injectors before the splice that goes to all 4 injectors. Probably would of been an easy find.

 

I checked it out, twice. Still had the original tape around spliced part and was tightly in place. Even when I pulled the tpi out for the last time I looked all the wiring connections and nothing was out of the norm. Still have no idea what it was and I never will because the tpi is out and sold and the carb is in and running already lol.

 

I had one side go dead on mine. Turned out to be a blown fuse!

 

If I'm not mistaken, the injectors have a constant +12V on them all the time, it's the ground that gets switched. I don't know which side the fuse is on - it might be on the ground.