85 K5 Build (What to do this summer...)

[down4thakrown]

Nope idleing if might get up to 150. But takes a loooong time. Factory gauge with brand new sensor reads about same in the head. Sensor for efi is in intake near t-stat. Its got a huge 4 row brand new all aluminum radiator. With 7 blade fan and hd clutch. Since I put fitech on its never gotten over 172. That's towing my 10k toy hauler singing a good tune at around 3k rpms, going up hill during hottest part of day 85* well over 7k elev. That's when I was chasing vapor lock issue though, Havnt tried it with new pump set up yet.

 

[skunked]

That just doesn't sound right. Are you sure you put a t-stat in it? Lol

where is the other gauge reading from?

Not sure if you know but there has been some issues with the coolant temp sensors being off 15-20 degrees. Most have replaced them with a Delco sensor.

 

[Bent77]

That's enough to piss an ECM off good

 

[454Sub]

Definitely cold enough to keep it in open loop or cause it to otherwise not be happy.

 

[down4thakrown]

other sending unit is in head in-between no 1 and 3 cyl. I'm pretty sure t-stat is in it. Lol but it is a fail safe one. Maybe it's stuck open? The heater doesn't even blow hot. Lol I'm going to check tstat too. But surprisingly I got it to run decent.

 

[Sjudy98]

other sending unit is in head in-between no 1 and 3 cyl. I'm pretty sure t-stat is in it. Lol but it is a fail safe one. Maybe it's stuck open? The heater doesn't even blow hot. Lol I'm going to check tstat too. But surprisingly I got it to run decent.

I wish I had your problem its 105* here and my truck runs a little warm especially on the trail going up some inclines.

 

[down4thakrown]

I wish I had your problem its 105* here and my truck runs a little warm especially on the trail going up some inclines.

eBay has the radiator I bought. And there not that expensive. Factory replacement too.

 

[Sjudy98]

eBay has the radiator I bought. And there not that expensive. Factory replacement too.

is the quality good?

 

[down4thakrown]

So far so good. Looks good. I'll get some pics of it when I get home. There might be some pics in my burb build thread too.

 

[down4thakrown]

The only thing I didn't like is the heater return hose bung has a bolt to plug it. And its only a 3/8's bolt. So it's pretty restricted.

 

[Big Ray]

Try a 2 psi check valve in the return line. That will help with vapor locking. Put it as near the tank as you can...after you check the t-stat first.

 

[down4thakrown]

Try a 2 psi check valve in the return line. That will help with vapor locking. Put it as near the tank as you can...after you check the t-stat first.

Got a link or pic of the check valve I should be looking for? Thx

 

[down4thakrown]

Pics of the radiator and the stuck tstat

 

[Sjudy98]

Bought some benchmark abrasives after seeing @Deuling instagram post. I also got a 30amp relay and am going to run the FiTech Fuel pump on that to determine if there is an electrical issue.

 

[Sjudy98]

wired the relay in and fired it up. Fuel pressure is at 38 while idling and 30 when reved up so im assuming thats the issue.

 

[Sjudy98]

@skunked do you have any ideas on the low fuel pressure, bad regulator?

 

[skunked]

Could be a regulator, pump, shit in your tank/filters.

 

[Sjudy98]

Could be a regulator, pump, shit in your tank/filters.

Thinking about switching to the volvo pumps my friends with TBI swaps like them.

 

[skunked]

If you do anything I would go in tank.

 

[ekajkrats]

You should pull the regulator and see if the screen has any debris. That's an easy first thing to check.