possible pcv issues
#1
Member
Thread Starter
possible pcv issues
so when driving along about 50-55 let off the gas it seems to take too ling to come back down to idle. stays about 1500 rpm
noticed a air suction sound till it does finally drop. I have replaced the iac valve. it was making a chattering sound and would
idle up then drop to real low then about normal.
was wondering if the pcv valve would have anything to do with this. I noticed the hose was on the older side. maybe when warmed up
its choking out the vacuum that it needs.
trucks an 03 4.6
noticed a air suction sound till it does finally drop. I have replaced the iac valve. it was making a chattering sound and would
idle up then drop to real low then about normal.
was wondering if the pcv valve would have anything to do with this. I noticed the hose was on the older side. maybe when warmed up
its choking out the vacuum that it needs.
trucks an 03 4.6
Last edited by Snipersteve; 01-20-2019 at 02:25 PM. Reason: oops
#2
so when driving along about 50-55 let off the gas it seems to take too ling to come back down to idle. stays about 1500 rpm
noticed a air suction sound till it does finally drop. I have replaced the iac valve. it was making a chattering sound and would idle up then drop to real low then about normal.
was wondering if the pcv valve would have anything to do with this. I noticed the hose was on the older side. maybe when warmed up its choking out the vacuum that it needs. ....
noticed a air suction sound till it does finally drop. I have replaced the iac valve. it was making a chattering sound and would idle up then drop to real low then about normal.
was wondering if the pcv valve would have anything to do with this. I noticed the hose was on the older side. maybe when warmed up its choking out the vacuum that it needs. ....
Have you checked the PCV hose where it goes into the base of the throttle body?
It's hard to see, but you may have a hole in the hose back there.
The hose is just plain neoprene hose and should be reinforced like fuel hose so it would last longer.
#3
GO SOX!
Sounds like a large vacuum leak from those symptoms, not a choked vacuum.
Have you checked the PCV hose where it goes into the base of the throttle body?
It's hard to see, but you may have a hole in the hose back there.
The hose is just plain neoprene hose and should be reinforced like fuel hose so it would last longer.
Have you checked the PCV hose where it goes into the base of the throttle body?
It's hard to see, but you may have a hole in the hose back there.
The hose is just plain neoprene hose and should be reinforced like fuel hose so it would last longer.
#4
Member
Thread Starter
Sounds like a large vacuum leak from those symptoms, not a choked vacuum.
Have you checked the PCV hose where it goes into the base of the throttle body?
It's hard to see, but you may have a hole in the hose back there.
The hose is just plain neoprene hose and should be reinforced like fuel hose so it would last longer.
Have you checked the PCV hose where it goes into the base of the throttle body?
It's hard to see, but you may have a hole in the hose back there.
The hose is just plain neoprene hose and should be reinforced like fuel hose so it would last longer.
ill have to give this a check when the weather permits.
will the carb cleaner method work on finding a vacuum leak on this, (spray carb cleaner around if the idle rises thats the leak)
#5
Member
Thread Starter
Think i have found my problem (possibly) the Electric Vacuum Regulator. This seams to be where my vacuum sound is coming from.
when i let off the gas when driving. (When i do it feels like the throttle is still open for a while)
when i let off the gas when driving. (When i do it feels like the throttle is still open for a while)
#6
Senior Member
This ^^^ is the most common fix. If your warm idle in park is above 750 rpms, then you can most likley find the leak by following the PCV line with you hand around it all the way to the back. They usually leak back by the firewall, the elbow as mandingo32 and R&TBabich posted above. A lot of time you feel the leak or plug it with your finger while the engine is running, idle will change, - there's your leak. These engines warm idle in park should be around 720-735 rpms...that's without leaks.
#7
Member
Thread Starter
well it not idling high, somewhere between 700-800 at idle (after a 30 min. drive at 50-55mph) hard to tell exact number on the factory tach.
the only problem is when Im driving and it sounds like the EVR does when you shut the truck off.
when you let off the gas (like the throttle doesnt shut like it should)
the only problem is when Im driving and it sounds like the EVR does when you shut the truck off.
when you let off the gas (like the throttle doesnt shut like it should)
Last edited by Snipersteve; 02-11-2019 at 08:47 AM. Reason: a;sldkjf