Well the title explains it all. My 95 4Runner 3.0 Auto has been stumbling on the frst cold start in the morning for the past few weeks. It will turn over on the first try then hesiatate at like 3-500 RPM'S like it wants to stall then it will shoot up to the normal 1500 or so. I replaced the plugs, wires, cap and rotor along with the head gasket, timing belt and water pump about 6k miles ago. It also has a new 02 sensor. I'm thinking maybe it's a fuel issue, something as simple as a clogged fuel filter because at 162k miles I know it's never been changed. Any thoughts? It's only on the first start of the day and then it's fine. I'm in Mass and it's been cold the past few days but it seems to do better when warm. Oh yeah, the starter is less than a year old as well. I'm gonna run some inector cleaner through it on the next tank. Any reccomendations on what kind of injector cleaner I should get. I usually just go with Chevron or something like that. Cheers, Paul

 

I've been having the same problem once in awhile. Not every day, but when it happens the truck has been sitting for at least 12 hours. No other problems. I was thinking that the fuel system was losing pressure while it sat, but I haven't been able to find any evidence of a leak. Anyone else have this problem or an idea what it might be?

 

Same problem.
Also did wire, plugs, distro cap & rotor
I put in +4 plugs and while it worked fine for the first 10k or so, I'm thinking this could be a contributing cause?

 

Personally, I'm leaning towards the fuel filter as the culprit. Right now I'm too lazy to change it though.

 

I've been thinking more about this since I posted and I'm thinking it's the fuel pressure regulator actually. I got a code 25 a month or two ago and I replaced the 02 sensor and it never came back but since you mentioned pressure MTNFREAK and that it has to sit for 12 hours has me thinking it's the fuel pressure regulator. Mine only does this if it's been sitting for an extended period of time as well. Mine is intermittent and isn't really a problem yet anyways I was just fishing for some ideas.

 

mine does the same thing every morning and anytime after sitting about 6 hours when its cold outside. i have replaced all the usually suspects as well. it drives me insane. i have a fuel filter sitting in my garage that i need to get around to putting in. i hope it helps. keep us updated on your situation.

 

if yourinjectors are getting clogged, it coudl be calsing them to leak when turned off, this causing the pressure in the system to go down as describbed.

 

What would you recommend running through the gas tank to unclog the injectors, mikewic?

 

Seafoam.

 

i/ve ran seafoam threw my truck three times. does not help at all.

 

Have you checked your cold start injector? If that's ok, I'd say check your fuel pressure regulator and pulsation damper.

 

same problum here for like 5 monthe only in the morn or if it sits ya no. did wires plugs cap still dose it. dose it take a wile fer ur guys temp gage to go up too. i have that aswell. eney solutions
andy

 

Low temp