85 22RE loading up/miss until operating temp

Hey everyone hopefully I'm in the right place, just seeing if anyone has an idea where to start with this puzzle.. 85 pickup 4x4 22RE, when starting the truck it will miss, load up and blow blue/black smoke out (smells like fuel) until the engine warms up then the missing goes away (truck runs and starts good when hot). Fuel injectors are new, cold start sensor new, distributor cap/rotor is new, spark plugs/wires new, no check engine light, engine with 50k miles on it (newer head/valves/cam). One of the weird things is the fuel mileage has gone to crap.. 4 gallons in 30 miles. TIA

 

I had so many problems with mine when I replaced the motor in my 85. I do not remember how much it was, but I had to go with a new MAF and TPS. Make sure your knock sensor is also properly torqued down and does not rattle out. That caused a major headache for me as well.

Might as well get a new O2 sensor while you are at it.

 

Thanks for your response, one of my thoughts is maybe the coldstart injector staying open. I agree on having issues after the new engine, seems to be the same story here. The old one was flawless until the head gasket went at 450k miles

 

Sounds like a head issue to me, maybe a gasket. Do you have milky oil? Ever do a leak down test? Notice any coolant loss?

 

The problems were not due so much to the engine, but rather unplugging and plugging back in 30 year old sensors.

I now have several sensors where the male and female clips are being held together with zip ties since they are so old and brittle plastic pieces.

 

A friend of mine has dealt with many woes from his 22re. It had intermittent hard hot starts, worsened mpg, black smoke at startup, Miss in hot and cold conditions, and a dead spot in the rpm band between 2000-3000rpm.
He started out by doing the fuel pump, regulator, thermotime switch (controls cold start valve) and cold start valve. These fixes helped the black smoke at start and evened the idle a bit but didn't solve everything.
Then cleaned the throttle body and a new TPS sensor. Finally what fixed all of the shenanigans was the coolant temp sender. His had failed and the sender worked intermittently allowing the truck to sometimes start without a hitch and other times not start without lots of cranking and black smoke. The rpm dead spot was also cured, the miss disappeared, black smoke cured and all is well now because of a $20 part from napa.

 

It has a brand new head and head gasket on it (50k miles since) no chocolate milky oil or bubbling in the heater core when you open it, but a leak down test would probably be a good idea thanks for the info

 

I think your on to something here, I just started wrapping all of the connections that seem loose, hopefully it helps

 

Yeah we have done most of those as well minus the TPS and coolant temp sender and cold start injector.. we did the thermotine switch and no difference

 

@Fordconvert might also be on to something. It may have been this truck where the temp sender was also bad.

But, most of my problems, including excessive fuel consumption like yours, went away after a new MAF. And check the intake tube and rubber elbows for any cracks that might cause vaccuum issues to mess with the MAF reading.

While you are at it, might as well do a vaccuum leak test with an open, but UNLIT propane torch and listen for any idle spikes. Engine installs can be frustrating and tedious, especially when working with such old equipment.

 

Good looking out! Thanks and fingers crossed! Good luck with yours as well