brillo_76
Elite Member
I dont think there are any sensors reading the fuel pressure on 3rd gens. However, I maybe wrong.
I just wanted to verify the pressure was dropping to crap when stalls and runs incorrectly.
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So Im back......
- Thread starter sweet88gt
- Start date
I just wanted to verify the pressure was dropping to crap when stalls and runs incorrectly.
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sweet88gt
New member
Is there a way to test the MAF ? I cleaned it twice in 3 months just to make sure. How can I test to see if it is failing after a heat cycle ?
Im looking at anything I can check to confirm Im on the right path.
Fuel pressure I will do while running if I can figure out a safe way to do it with my limited tools.
Really no warning on the stall comes out of no where.
Only when warm engine never cold.
Im looking at anything I can check to confirm Im on the right path.
Fuel pressure I will do while running if I can figure out a safe way to do it with my limited tools.
Really no warning on the stall comes out of no where.
Only when warm engine never cold.
Almost sounds like vapor lock but I have never heard of that being an issue on these trucks.
Intermittent problems like this can be really frustrating to deal with. Keep the faith!
NJ-4Runner
Member
When you clean the MAF there is more than one area to clean, this is not immediately known when you take it out and look at it. When you take off the MAF the one hard wire with the "bulb" on it is easily seen. However if you look down inside the small tube there are another 2 small wires way in there. Look with a flashlight. Those are the two wires you have to spray and make sure they are clean. I recently picked up as 4Runner that was not running right and this solved the problem....score.
sweet88gt
New member
So I parked the 4runner in the back yard and it only gets attention when I get extra time.
Today I pulled codes pending misfire 1-2-6
No engine light. Then the codes go away after the truck gets warmed up. Probably my scanner sucks.
But I did notice something odd. The battery voltage was low. I recently changed the battery because one of the kids left the door open and the old battery wouldn't charge overnight.
I test the alternator with my tester and Im only getting 13-13.3 volts at the battery. I test the alternator with a Dayton battery tester that can check charging systems. 13 or so volts.
With that said, can the low voltage only cause intermittent misfires??
Today I pulled codes pending misfire 1-2-6
No engine light. Then the codes go away after the truck gets warmed up. Probably my scanner sucks.
But I did notice something odd. The battery voltage was low. I recently changed the battery because one of the kids left the door open and the old battery wouldn't charge overnight.
I test the alternator with my tester and Im only getting 13-13.3 volts at the battery. I test the alternator with a Dayton battery tester that can check charging systems. 13 or so volts.
With that said, can the low voltage only cause intermittent misfires??
sweet88gt
New member
So question is what is the typical output of a stock alternator ? Voltage reading through dash scan was 11.8-13 volts. Im guessing that is what the computer is seeing not not so sure its correct though the app. Voltage reading at the battery at idle is 13-13.3 volts.
I highly doubt this is related to my misfire.
I highly doubt this is related to my misfire.
LittleCaesar
New member
You really need to be seeing at least 13.3. A remanned one out of the box at a cold start should be 14.2~14.4 volts.
sweet88gt
New member
I have always thought alternators should put out at least 14 volts. Thats why 13 volts concered me. What caught my eye is in the dash scan it was seeing 11.8
sweet88gt
New member
Did a little test this morning cold start. Alternator putting out 14.2 volts.
Going to run it with tester hooked up and Im sure once hot numbers will change.
Coincidently all of my issues are only once it gets nice and warm on the misfires. Not saying the alternator is to blame but its not helping the situation either.
Going to run it with tester hooked up and Im sure once hot numbers will change.
Coincidently all of my issues are only once it gets nice and warm on the misfires. Not saying the alternator is to blame but its not helping the situation either.
brillo_76
Elite Member
I seem alternators flake out when hot or cold. Mostly hot because metal expands when it gets hot. May not be the issue but be great to rule it out.
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19963.4lsr5
New member
The voltage regulator is temp compensated. So the hotter the underhood temp the lower the voltage output. But it shouldn’t go below 13.4 ish.
When I bought my 97 SR5 project it had a reman CarQuest Alt that was only 2 years old. The brushes were shot at the 3 year mark.
They use cheep soft brushes that don’t last long.
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When I bought my 97 SR5 project it had a reman CarQuest Alt that was only 2 years old. The brushes were shot at the 3 year mark.
They use cheep soft brushes that don’t last long.
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sweet88gt
New member
I haven't looked into a kit but looking to rebuild the one I have.
sweet88gt
New member
I seem alternators flake out when hot or cold. Mostly hot because metal expands when it gets hot. May not be the issue but be great to rule it out.
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Still searching but not confident this is my main issue. Just another to do on the list.
