Notices
86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

90 Pickup 3vze bogs down with Brake Depressed

Old 10-08-2014, 04:31 PM
  #1  
Registered User
Thread Starter
 
Join Date: Oct 2011
Location: Northeast PA
Posts: 14
Likes: 0
Received 0 Likes on 0 Posts
90 Pickup 3vze bogs down with Brake Depressed

Hey everybody,

I have a 1990 Pickup v6 4wd with 150k and shes never given me a problem really... till now, ugh.

When i have the brake pedal depressed it sounds as if its going to stall, but always catches itself and stays at an even idle. The bogging almosyt sounds as if theres a heavy draw on the electrical system (IE if you were to let the clutch out to fast and its near stall, low RPM, yadda). Though the lights dont dim, radio doesnt cut out, basically everything is fine.... other than the engine sounding as though it will stall.

It only happens with the brake pedal depressed, in neutral, and is very inconsistent. It might happen just once at a stop light, or it may be every other second. Never completely stalls, and as soon as i let go of the brake and have it in first and pull away all is well.

Just put in new plugs, and wires. Also a new alternator with the last 10k. I have an optima yellow top battery as well.

Hoping you guys can help me with a diag. and help me correct this.

Thanks Everybody.
tscheuch is offline  
Old 10-08-2014, 04:46 PM
  #2  
Registered User
 
Join Date: Sep 2007
Location: San Francisco East Bay
Posts: 6,659
Likes: 0
Received 116 Likes on 103 Posts
Check the brake booster. http://personal.utulsa.edu/~nathan-b.../3checksan.pdf (page 7).

If there's a leak, you'll end up with a big vacuum leak, which could (should) kill the engine.
scope103 is online now  
Old 10-09-2014, 01:47 PM
  #3  
Registered User
Thread Starter
 
Join Date: Oct 2011
Location: Northeast PA
Posts: 14
Likes: 0
Received 0 Likes on 0 Posts
Thanks for the reply scope.

The engine doesn't ever die completely, and is intermittent but always sounds exactly the same. A quick dip in the RPMs and the right back to normal idle.

I'm going to check all my vacuum lines this weekend just to make sure and thank you for the helpful PDF as well.

Another thing I'd like to mention is that if the truck is in gear and I have my foot on the brake (IE slowing down in gear) the intermittent RPM dip does not occur. Would the brake booster issue still occur in this circumstance?

Thanks again for your time, TRULY appreciate it.

-Ty
tscheuch is offline  
Old 10-09-2014, 03:04 PM
  #4  
RJR
Registered User
 
Join Date: Jul 2012
Location: Northern Colorado
Posts: 1,669
Likes: 0
Received 25 Likes on 22 Posts
You mention a clutch, so it sounds like you have a manual. In that case the engine can't intermittently slow down while you're coasting in gear - it's locked to the rear wheels and has to maintain the appropriate rpm for your speed and gear.

I think scope is right on with the brake booster leak. Follow up on that and let us know what you find.
RJR is offline  
Old 10-09-2014, 04:14 PM
  #5  
Registered User
 
oldblue's Avatar
 
Join Date: Mar 2009
Location: Georgia
Posts: 390
Likes: 0
Received 0 Likes on 0 Posts
remove the vacuum line from the booster and plug it off, a finger will work. then have someone else hit the brake pedal and see what happens
oldblue is offline  
Old 01-24-2019, 02:02 PM
  #6  
Registered User
 
Join Date: Nov 2015
Posts: 4
Likes: 0
Received 0 Likes on 0 Posts
Sigh.

I wish people posted their progress.
JToyota4x4 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
RedRunner_87
95.5-2004 Tacomas & 96-2002 4Runners (Build-Up Section)
83
09-07-2017 07:14 AM
Kalihi,HI
86-95 Trucks & 4Runners
3
07-09-2015 04:29 PM
God's Bounty Hunter
Pre 84 Trucks
6
07-08-2015 12:54 PM
Jnkml
95.5-2004 Tacomas & 96-2002 4Runners
3
07-06-2015 01:20 PM
MTLroadierunner
86-95 Trucks & 4Runners
0
07-06-2015 12:17 PM


Thread Tools
Search this Thread
Quick Reply: 90 Pickup 3vze bogs down with Brake Depressed


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 Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: