Hard start issues

[900exdriver]

I’m losing my freakin mind on my current hard start issue. I’ve read more threads on this issue then I’d like to admit. I’ve tapped on to others threads on my issue so I decided to start my own.

I’m confident this isn’t a immobilizer issue. Security light goes out when key is inserted. Cranks strong. First start of the day it won’t catch until a third or fourth try. Once it starts it runs a little rough for 20-30 seconds then it purrs like a kitten. Smells like fuel/rich. The rest of the day it starts up like nothing is wrong. Let it sit overnight and have the same issues the next morning.


It’s ‘99 with 331k. I just had my transmission rebuilt. Didn’t start having this issue until two weeks after the work was done.

Here’s what I’ve replaced
EFI fuse and relay
Newish battery (11/18)
Denso injectors
Denso spark plugs
Denso MAF
Denso coils
Denso fuel pump
Fuel filter
Fuel pressure regulator
Fuel damper
Replaced cracked rubber hoses
Steering check valve
PCV valve
Crankshaft position sensor
4 Denso o2 sensors

I have a camshaft position sensor sitting in the box. Grounds look good. Throttle body cleaned.

Looking for help before I go insane. Any criticism or advice accepted. Here are my numbers as of today.

A few seconds later the FT #’s are a little different.

 

[Salty75]

Ever resolve this? Mines been doing the same

 

[MongooseGA]

He sold the truck and bought a GX.

 

[900exdriver]

He sold the truck and bought a GX.

Haha, that’s how I fixed it. Got rid of it. I think the buyer said it was one of the new injectors. It was stuck open and dumping fuel into the cylinder.