Vacume lines

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

S

steveinil

Junior Member
Joined
Aug 27, 2024
Posts
2
Reaction score
1
Location
Illinois usa
First Name
Steve
Truck Year
1990
Truck Model
R30 crew cab
Engine Size
454
Hi all. I recently purchased a 1990 crew cab dually. When I went to look at the truck it ran and drove pretty good. It was running off of a tank in the bed as the factory tanks and pumps were shot. So new tanks pump and switching valve and truck runs but won't idle for crap and it kinda falls on ts face when you hit the gas. I thought maybe it was a vacuum leak so on the throttle body I plugged the evap and egr vacuum lines and even the pvc. Didn't help. No emissions here. Do I need the evap or egr? Pvc I can see but do I need the others? Going to put a new fuel filter on it first see if that helps. I know the truck sat for a few years. So I'm sure it needs a tune up also.
 

Attachments

  • 20240820_185215.jpg
    20240820_185215.jpg
    298.4 KB · Views: 13
R

Ricko1966

Full Access Member
Joined
Apr 11, 2017
Posts
5,292
Reaction score
8,414
Location
kansas
First Name
Rick
Truck Year
1975
Truck Model
c20
Engine Size
350
Egr and Evap aren't just about emissions. Do some research, make up your own mind because everyone's got an opinion. My opinion, egr,reduces knock sensitivity,allows more ignition timing,reduces pumping losses and is good for a bump in mpg. Evap keeps moisture out of the tank,and keeps the fuel from evaporating,so you can burn it instead of just letting it vent. If it ran fine before you swapped tanks and pumps, I wouldn't start blaming EGR. I'd be looking at what changed when I started changing things. And no emissions testing doesn't mean it's legal to disable emissions equipment,it just means the chances of getting caught or denied registration is very low.
 
Last edited:
fast 99

fast 99

Full Access Member
Joined
Dec 31, 2021
Posts
1,957
Reaction score
2,808
Location
Spokane, Washington
First Name
Brian
Truck Year
81,85
Truck Model
K20
Engine Size
350
Could be a lot of things, from coolant sensor to base plate gasket, fuel supply on and on. There are inexpensive adapters that will allow access to diagnostic information. TBI systems are fairly simple, but basic information is needed to pin down a proper repair.

I am totally against removing emission items on any computer-controlled vehicle. Not because I am a tree hugger but when emissions items are removed, the check engine light will be on. If something important fails later on you will ignore the light.
 
You must log in or register to reply here.

Similar threads

T
mark 4 454 engine oil cooler lines
Replies
8
Views
663
TheC5Surgeon
T
cbrown5385
So I’m having an issue with fuel pump
Replies
6
Views
338
Ricko1966
R
K
Vapor lines from tanks
Replies
7
Views
874
kayardee813
K
B
700R4 Trans Cooling Lines options/recommendations?
Replies
7
Views
811
timbritton
timbritton
T
Repeated stalling
Replies
11
Views
311
T man
T

Latest posts

Forum statistics

Threads
43,859
Posts
944,639
Members
35,889
Latest member
405dalton
Top