It's from the CTS for the EFI. It's in the coolant passage at the front of the intake.
CK5
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'89 R3500 Crew Cab 2wd to 4wd conversion & beyond
- Thread starter mrk5
- Start date
Started out with 2wd TBI350 with SM465 to current 4wd with 454, 700r4, NP241
Dude you haven't lived until you get your brick above the century mark
That sounds scary.
gotcha. Do you have one in the head?
lugging up hills in the sierras I’ll hit 210 at the head but my intake temp stays below 200.
I don't, but I'm sure it was pushing 230F. I was trying to slim down on the gauges and just use the CTS.
with all the documented CTS issues I decided to add the temp gauge to verify the readings it’s been providing. The difference I’ve found is about 15sh degrees between the two.
I did replace the one that came with the EFI, so I was hoping I could rely on it. I kinda figured the difference would be at least 10 degrees.
Yeah I've been running the 6.2 radiator and mechanical fan for 3 years now. It's going right back in with the 8.1 when it's done.
Larry's pushing 8,200 pounds in his truck and camper combo and is running the same setup. As is our buddy Ian who's running the same 8.1/nv4500 combo. He's also running the 6.2 radiator with a mechanical fan.
All three of us had zero issues with the cooling systems on the latest desert trip. The previous year when I missed had Ian and Larry plowing around Death Valley in 110 degree heat or higher. Both were running a/c nearly constantly while in the valley and had no cooling issues what so ever.
Larry's pushing 8,200 pounds in his truck and camper combo and is running the same setup. As is our buddy Ian who's running the same 8.1/nv4500 combo. He's also running the 6.2 radiator with a mechanical fan.
All three of us had zero issues with the cooling systems on the latest desert trip. The previous year when I missed had Ian and Larry plowing around Death Valley in 110 degree heat or higher. Both were running a/c nearly constantly while in the valley and had no cooling issues what so ever.
Could I use an 8.1L fan and clutch?
Is that reverse rotation?
Mark is right, the 8.1 stuff is reverse rotation. But sourcing a HD clutch for a factory big block truck with v-belts shouldn't be too hard. Add a fan for the same truck, 454 or 6.2 and it should fit.
yep my findings on the holley sniper unit was 15-18 degree off for the kits temp sensor . i swapped in my old tbi unit sensor and bam on the money .
i just dont get how they still sell the kit knowing bad parts and not offer swap out with a GOOD part and not the same batch of crap parts to fix it . just goes to show they dont care .
i just dont get how they still sell the kit knowing bad parts and not offer swap out with a GOOD part and not the same batch of crap parts to fix it . just goes to show they dont care .
Just shows how much they nickel & dime the low end efi kits.
I put a Holley Sniper on my shop truck. I never thought converting to EFI would be a downgrade from a carburetor, live and learn.
Mine is still running fine. It's up to about 4,500 miles now after they replaced the first unit that had the failed ECU. Every time I see a post like this I knock on wood.
I've replaced my IACV, I had to send the whole unit in to get a fuel injector replaced, it still idles like crap (because of the way it's designed, no atomization of fuel at idle) and I've had numerous other issues with it. When I sent it in to get it repaired, they told me that they don't recommend running the progressive linkage (which is ridiculous). I left it on for now, but I'm just waiting until I have time to do an LS swap on it.
Delco’s are bad out of the box all the time.
I did not like the progressive linkage on mine. I'm just hoping mine continues to operate fine. I don't really want to pull it off and swap to a different EFI if I don't have to.
That sounds like heresy.
