1991 toyota 4 runner - Engine Troubleshooting


	Auto Repair Home	SEARCH POSTS	WHO'S ONLINE	LOG IN

Automotive Repair

Car Troubleshooting Topics
  Car Troubleshooting
  Engine Troubleshooting
  Engine Fault Codes
  Electrical and Wiring
  Transmission Problems

Car Repair Topics
  Car Making Noises
  Car Stereo Repair
  Heating or AC Issues
  Motorcycles and ATVs
  Tricks of the Trade
  Truck Repair Advice

Site Options:
  Login
  Sign up here!

Latest Forum Post

Strut spring orientation and strut mount tension nut

2017 Nissan rogue awd 2.5 L Put in Monro...

Transmission stuck in part, I have tried everything

So I'm working on my elderly fathers 201...

2017 dodge journey LED headlights on/off randomly

Year of vehicle 2017 Make of vehicle dod...

Kia Soul starter replacement issues!

Okay so my car is a 2010 Kia soul 2.0 en...

Please Help - Knock sound & engine fail

Hi all, Hoping to get some insight and ...

multiple warning lights

2013 GMC Terrain 130,000 miles 4 cylinde...

03 alero no low speed blower

Good day everyone, I have a 2003 Olds a...

04 Chevy 2500hd tail light issues

Help!!! I have changed my combo switch...

1999 Grand Caravan Sport not starting.

Hi. I'm new here. I hope someone can hel...

Brake Seals Bulging

2021 Toyota Corolla LE 1.8l 65,000 mile...

1991 toyota 4 runner

Sign up here!

Search for (search options)

Auto Repair Home>> Automotive Repair>> Engine Troubleshooting

cbranum
New User

Sep 15, 2011, 7:28 AM

Post #1 of 4 (2763 views)

1991 toyota 4 runner	Sign In

Hey guys,

I have a 1991 Toyota 4 runner with a V6 motor(200k mi). It seems to be cutting off while going down the road. it drops 500-1000 RPM. but continues to run. It will do this 4-5 times in a 30 mile distance. It runs good and has good pressure. I have replaced fuel filter, plugs, wires, Rotor cap. It does this at all speeds and in all gears. Its bad....it feels like some thing is getting sucked through the motor lol!(i know its not). Starts fine, idles fine and runs well. Any help would be great!

Thanks

re-tired
Veteran / Moderator
re-tired profile image

Sep 15, 2011, 7:48 AM

Post #2 of 4 (2746 views)

Re: 1991 toyota 4 runner	Sign In

I have had several 4 runners of that era have had problems with intermittant fuel pump drop in pressure. The way I finally caught it was to install a fuel pressure gauge and run the line up the rear of hood and tape to windshield. Drove on a light traffic road till it did its little trick and low and behold , the pressure dropped a few seconds before. If you are capable of copying this test be very carefull triple check for leaks.

LIFE'S SHORT GO FISH

cbranum
New User

Sep 15, 2011, 8:03 AM

Post #3 of 4 (2739 views)

Re: 1991 toyota 4 runner	Sign In

so the fix is fuel pump? fuel pump had crossed my mind but so did a coil or ignitor as they call it. When it does it, its really hard like your running over a 2x4 in the road or something. thanks for the fast reply.

re-tired
Veteran / Moderator
re-tired profile image

Sep 15, 2011, 8:28 AM

Post #4 of 4 (2719 views)

Re: 1991 toyota 4 runner	Sign In

Yes a bad ignition component is a possibility. The only way to find a intermittant problem such as this is a process of elimination. Hard to monitor ignition /spark on the go . That is why I choose to monitor fuel . If the fuel press remains steady THEN you can start chasing those electrical gremlins.

LIFE'S SHORT GO FISH

Search for (options) Privacy Sitemap