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1995 Isuzu Truck Vacuum Canister Problems

Tiny
METALMOSES18
  • MEMBER
  • 1995 ISUZU TRUCK
  • 4 CYL
  • 2WD
  • MANUAL
  • 138,000 MILES
Upon inspecting my engine, I've noticed that all my hoses on the Vacuum canister are not connected. There are 4 spots for hoses. 3 on top, 1 on bottom. The top three are connected as they are supposed to be. However, I cannot, for the life of me, find where the bottom hose is supposed to go. It was completely missing, so I bought another hose in hopes I could find the spot it was supposed to go. However, I have had no luck. Could you please tell me where this hose needs to go? The port on the bottom sucks in, as I've noticed by putting my finger against it and playing with the throttle.

I don't know if this problem is tied in to my other problem. The vehicle jumps when in the high revolutions of the engine. It doesn't do it all the time, and it seems if I press the throttle in all the way, it won't do it. I don't know if the hose is the source of this problem or not, I'm just trying to give you some background so you'll have a better idea of what I'm looking at.

I'm not too proficient with vehicles, but I can do what I need to as long as I'm pointed in the right direction. Thank you very much.
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Wednesday, December 23rd, 2009 AT 5:02 PM

7 Replies

Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Hello MetalMoses18

Welcome to 2carpros and merry Christmas

The bottom hose is supposed to go from the canister to the intake manifold.
Because of vacuum leak the vehicle jumps as you said.
Connecting the hoses right should take care of the problem.
Use this diagram to help you connect it back.


https://www.2carpros.com/forum/automotive_pictures/46384_0900c15280076dfc_5.jpg

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Thursday, December 24th, 2009 AT 11:19 AM
Tiny
METALMOSES18
  • MEMBER
  • 4 POSTS
If you look at the diagram, and look at the canister, you'll see the cone part on the bottom. Your arrow runs right by there. Is that supposed to be open to the air or should there be a hose running somewhere? As it stand right now, it's open to the air. There is no hose attached to it, and I can feel the air flow from it. So should there be a hose attached or does it just sit like that? Thank you.
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Saturday, December 26th, 2009 AT 8:06 PM
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Hello MetalMoses18

Yes it should be like that. Nothing should be connected below there, its job is to suck inn air.
If there was a problem with the evaporation system, a DTC should be set.
Do you have engine light on?
Check the fuel pressure.
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Saturday, December 26th, 2009 AT 9:00 PM
Tiny
METALMOSES18
  • MEMBER
  • 4 POSTS
The check engine light is not on. I replaced the fuel filter, it didn't help anything. Could the fuel pump be the source of the problem? Like I said, the main thing I'm trying to fix is the jumping. It died the other night, and I let it sit for a few minutes, and it started back up. It's the first time it ever died, and it did it after I had it in the high revs for a little bit. How would I go about checking the fuel pressure? Thank you.
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Sunday, December 27th, 2009 AT 9:16 AM
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Hello -

Is your vehicle a 2.2 L?
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Sunday, December 27th, 2009 AT 10:25 AM
Tiny
METALMOSES18
  • MEMBER
  • 4 POSTS
It's a 2.3L.
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Sunday, December 27th, 2009 AT 8:24 PM
Tiny
MATHIASO
  • MECHANIC
  • 1,209 POSTS
Before testing the fuel pump, I would like to do a test on the charcoal canister to make sure it is working.

1988-95 MODELS 2.3 L
See Figure 3


https://www.2carpros.com/forum/automotive_pictures/46384_2_5.jpg



1. Inspect the canister for cracks or damage. Also check for leaking fuel from the canister.

2. With the engine OFF , disconnect the common chamber side hose (A) and blow air into it. The hose should be free from restrictions and the air should flow into the canister.

3. Reconnect the common chamber side hose to the charcoal canister.

4. While the engine is running at idle, disconnect the rubber vacuum hose (C) from the charcoal canister. Use a vacuum gauge to ensure that no vacuum is being applied to vents (B) and (D). If vacuum is exhibited at these ports, or if the common chamber side hose circuit is restricted, the charcoal canister must be replaced.
as I said before, the following figure shows that the hose below should be free for ambient air:


https://www.2carpros.com/forum/automotive_pictures/46384_0900c15280061f96_1.jpg



Do the test on the charcoal canister,if there is no problem with it, I will help for the fuel pressure.
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Sunday, December 27th, 2009 AT 9:10 PM

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