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Old 09-06-2018, 07:59 PM #1
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3rd Gen Dying Issue... Stumped

Hey guys,

1999 4Runner
3.4L
Auto
195k miles
locker
immobilizer

So I have a stock 99 3rd gen that will sometime die immediately after starting, and other times fire right up. The hard start doesn't matter if I hold the starter cranking or not. The truck has the antitheft ignition, so after it doesn't start I have to turn it all the way off and wait a sec, then try again.

Stranger issue, the truck will run pretty well after it starts, except sometimes it'll wanna die if not moving, usually while in drive at a stop light or something. It will just start idling low for 2 seconds or so, then just die. NO CEL. Will usually fire right back up. Truck seems to have full power when on the throttle.

Idle is normal for the most part. Will idle in the driveway in park at 700 rpm and not skip a beat for days. No CEL. No smoke. No Rust

Here is what I've done so far:
Replaced entire throttle body (2 different ones) This includes IAC, throttle position sensor, etc.
Replaced entire intake
Plugs, coil packs, wires (2 different sets)
fuel filter
2 different mass air flow sensors
oil change
searched high and low for a vaccumm leak, couldn't detect one.

and no change whatsoever.

I'm really at a loss right now and have reached my patience ceiling. Help would be sincerely appreciated. And if you come over and help me i'll feed you beer and pizza.
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Last edited by SAS T4R; 09-08-2018 at 01:30 PM.
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Old 09-06-2018, 08:23 PM #2
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fuel pump?
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Old 09-06-2018, 08:44 PM #3
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Quote:
Originally Posted by jgue467 View Post
fuel pump?
That's my last guess. I just really don't want to drop that tank unless I'm sure.
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Old 09-06-2018, 08:52 PM #4
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Iac? Just saw u posted that as changed I dont c the MAF listed unless i am failing to c that listed also

Last edited by clearock; 09-06-2018 at 09:04 PM. Reason: failed to read
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Old 09-06-2018, 08:58 PM #5
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how did u search 4 the vac leak? did u try spraying TB/carb cleaner around the intake etc while it was running? use a smoke machine? or...
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Old 09-06-2018, 09:13 PM #6
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Quote:
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how did u search 4 the vac leak? did u try spraying TB/carb cleaner around the intake etc while it was running? use a smoke machine? or...
Tried using propane around all of the lines to see if it would change idle or anything. I don't have a smoke machine though.
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Old 09-06-2018, 11:04 PM #7
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Take a fuel pressure reading and go from there.

How old is the battery? How are those terminal connections?
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Old 09-06-2018, 11:25 PM #8
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What voltage is the alternator putting out?
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Old 09-07-2018, 01:58 AM #9
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Mass air flow sensor....
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Old 09-07-2018, 10:04 AM #10
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Quote:
Originally Posted by SAS T4R View Post
That's my last guess. I just really don't want to drop that tank unless I'm sure.
Quote:
Originally Posted by jgue467 View Post
fuel pump?
Just replaced my fuel pump for the 2nd time in 300,000 miles, very similar to what you were experiencing. New pump, no hard starts, no foot on the gas starts, no dying issues at stop or while off the gas on the highway (scary!). Hope that helps!
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Old 09-07-2018, 11:12 AM #11
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It does sound fuel related.
Any hard starts that don't want to restart afterwards? If so, bang on the fuel tank and if it starts then, you'll know it's the pump.

Can you floor it fine without any coughing or stalling?

Any difference between if its started from cold (overnight) or when it's warm?
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Old 09-07-2018, 12:09 PM #12
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I also feel its fuel pump. I literally had to bang mine about 10 times the last few months to get her going. I'm about to get a new daily driver and park the 4runner so riding out the pump till I get new car or have time to replace it.
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Old 09-07-2018, 12:24 PM #13
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Quote:
Originally Posted by LittleCaesar View Post
Take a fuel pressure reading and go from there.

How old is the battery? How are those terminal connections?
Battery is newer, terminals are clean
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Old 09-07-2018, 12:25 PM #14
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Quote:
Originally Posted by clearock View Post
Iac? Just saw u posted that as changed I dont c the MAF listed unless i am failing to c that listed also
Will update post. Have tried 2 different mafs too
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Old 09-07-2018, 12:26 PM #15
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Quote:
Originally Posted by twitchee2 View Post
What voltage is the alternator putting out?
Alternator is putting out proper voltage when tested with a meter.
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