Mazda Pickup Trucks While Mazda may not be known for their trucks, they have always produced quality reliable trucks for both hauling cargo, or simply crusing.

Mazda 1998 B2500 Vacuum Leak

Old 05-10-2017, 11:25 PM
Junior Member
Thread Starter
Join Date: May 2017
Location: California
Posts: 1
Default Mazda 1998 B2500 Vacuum Leak

I have 1998 Mazda B2500 2.4L 4 cylinder manual transmission pickup that has a vacuum leak that I cannot find. The engine has roughly 255,000 miles on it.

Once the truck start and is warming up, if I rev the engine above 4000 rpm's, after I release the throttle the engine dies. I then start the truck again and it idles very rough. If I let the engine completely warm up, then I won't have this issue. Also, I disconnected all the vacuum hoses from the engine, minus the intake from the air filter, and hooked up a vacuum tester directly to the engine. The needle was vibrating 1-2Hg around the 19Hg mark.

It is not throwing any codes and it is passing SMOG though it is consuming more gas than before.

I have tested all the vacuum hoses coming from the engine and they have suction.

Any ideas?
Related Topics
Thread Starter
Last Post
Mazda Pickup Trucks
06-06-2010 02:33 PM
Jean Claude
Mazda Pickup Trucks
01-12-2009 07:18 PM
Mazda 323,Mazda 626 & Mazda 929
06-13-2008 10:19 AM
General Tech
04-04-2008 05:58 PM
Mazda Pickup Trucks
11-19-2007 01:26 PM

Thread Tools
Search this Thread
Quick Reply: Mazda 1998 B2500 Vacuum Leak

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to and affiliated sites.