hard start when cold still random misfire intermittently

hi again have issues starting truck when air temp is below 40 I have replaced iac valve plugs and wires cleaned maf sensor along with throttle body checked battery replaced coils I have done a compression test (normal 170) and a leak down test and I replaced injectors what's left once running it runs fine except for occasional p0301 code need help troubleshooting thanks

 

Throttle position sensor maybe? There’s threads on here with the values that are normal for the TPS. You can hit the pins with a multimeter and compare.

 

ok will try thanks

 

I have a similar issue with crappy idle at any temp. I have the tps, but haven’t put it on yet. If you can push the throttle like an old school carb engine and it cranks, then it’s likely the TPS from what I’ve read here. I’ve done plugs, wires, coils, MAF, and cleaned throttle body. Haven’t done a compression test or fuel injectors either but since it’s hard to start sometimes and the random misfire I’m thinking TPS. I’m going to change it when I get a chance and if it doesn’t go away, then I’m moving to cam/crank sensor next. I wish I would’ve bookmarked the threads.

 

I will try that sensor just have to get part

 

Shouldn’t be an issue for your engine. The 03-04 v6, Toyota doesn’t sell the TPS separately. I’d definitely only order the Toyota/Aisan part though. parts.mariettatoyota.com is who I use for Toyota parts. Can probably find a dealer close to you that does online sales too.

 

just tested sensor works fine (put some electrical cleaner on connection)it's a 2.4l 4 cylinder in fact just started right up but air temp is 52right now only seems to happen when it's cold below40 any other ideas

 

Could be intermittent. Mine doesn’t do it all the time. Other than that, crank or cam sensor possibly. I’m not sure.

 

yea I'm thinking maybe cps sensor