Idle surge and sticky revs

Tiny
RIPPLE2010
  • MEMBER
  • 1994 MAZDA B2600
  • 2.6L
  • 4 CYL
  • 4WD
  • MANUAL
  • 217,000 MILES
Okay, so my Mazda Bravo has been a small project I have been working on as my first car, and since we have had it it has had a small idle problem. When randomly the revs will drift up to around 1,500 then drop down again, as well as it has what I would describe as a sticky rev, so the revs don't go down as soon as my foot is on the pedal, they stay up for a bit then go down. Work we have done on the car so far has been,
a head replacement, new radiator, thermostat, water pump and a new camshaft,
from my research I think it could either be the fuel filter or a vacuum leak. But I need some more mechanically minded people to help identify the issue.
Sunday, May 31st, 2020 AT 6:51 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Hello,

Yes, a vacuum leak can cause this issue which is what I as thinking. this guide will help us confirm the issue:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

and

https://www.2carpros.com/articles/stall-at-idle

Please run down these guides and report back.

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Monday, June 1st, 2020 AT 12:27 PM

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