Chevrolet S10 Vacuum Leak Repair

For quite some time, my truckling has been suffering from a vacuum leak that would sometimes make the climate controls not work (especially under hard acceleration--needed to keep after the Keykeeper's supercharged Pontiac!). Also, when the engine was off, airflow would revert to the dash vents for some odd reason. (GM vehicles have a failsafe position that is a mix between the heater outlet and defroster vent.)

Category:

Autos & Vehicles

Tags:

• 2003
• chevrolet
• s10
• vortec
• v6
• broken
• rotten
• vacuum
• line
• fix
• repair
• replace
• uxwbill
• keykeeper
• truckling

[HamHockLV]

THANK YOU! My '99 S-10 had the same problem, and after watching this video, I was able to replace that short hose coming off the T and now all is well. Maybe it's just the "car wash effect", but the engine seems to run better too! One question, tho: I used 7/32" hose (that's what that much longer piece is) but I saw another video that suggests it's 5/32". The 7/32" is working fine, but I want it to be right.

[uxwbill]

@HamHockLV You are welcome. I'm glad this video helped you out! The engine likely *will* run better, as a vacuum leak will throw certain things off if it's bad enough.

I don't recall what size of hose I used. I probably did the highly precise thing and used whatever was laying around that happened to fit properly.

[yz100f]

if you look on my channel my 99 s10 4.3 starts then stalls three minutes after running any help would be apreciated

[uxwbill]

@yz100f This is the kind of thing that private messages are for (especially since Youtube never tells me of some comments, including this one). Please send one of those in future.

Is it always three minutes, and can you restart the truck? I suspect that something in the ignition system is cutting out, resulting in loss of spark and sudden shutdown.

[yz100f]

@uxwbill thats ok i ask like this because i usually ask many ppl and also for others with the same question know where to look but no now i cleaned egr and maf sensor cleaned throttle body and intake with carb cleaner cleaned iac and tps seemed fine now it runs like when i bought it runs for 10 min then sputters and dies always restarts then i do ten minutes ! im gonna try and clean crank position sensor tomorrow hope its that

[uxwbill]

@yz100f That's all well and good, but there is a letter limit here that makes things difficult. The presentation of replies is also messy.

I think your problem lies in either the high energy ignition pack, or possibly the crankshaft sensor.

[yz100f]

@uxwbill yea i took it to garage and im in records for codes haha i got 16 codes haha but the stalling is due to the crank sensor wich is causing extra U codes it was the first time i took a vehicle to the mechanics but now i know where to look

[uxwbill]

@tripovermyego Mine is presently doing something similar with air temperature, after a coolant change. I suspect trapped air or a bad thermostat, because the heat worked beforehand! The vents changing output is a result of vacuum loss. Engine vacuum drops at higher engine speeds, which explains that behavior. There's a leak somewhere.

[tripovermyego]

@tripovermyego Any ideas on what you think it could be? If it helps, it has the 4.3 Vortec and is 4wd.

[tripovermyego]

Ok maybe you can help me on this cause Im puzzled. My 97 S10 Blazer has heating issues. When it gets to operating temps, it will only blow warm air(not hot and not cold) thro the defrost and/or floor vents. If you put it on the vents, it blows cold air. Now, itll only blow warm air for a little bit then gets cold again. Also, if you have it, oh lets say defrost, and you give it gas to keep at highway speeds up hill, itll blow thro the vents. Let go, and it goes back to where you have it set.