I just did a full tune up. cap, rotor, wires, plugs, timing set at 4*. Just got a new fuel pump in May. I need to get the adapter to check fuel pressure. When I took the IAC out, the pintle moved in and out like a PCV valve. Ive been told its bad.
I just did a full tune up. cap, rotor, wires, plugs, timing set at 4*. Just got a new fuel pump in May. I need to get the adapter to check fuel pressure. When I took the IAC out, the pintle moved in and out like a PCV valve. Ive been told its bad.
You still didn't mention if this problem has always been there or if say it started after you did the tune up. When you go to check fuel pressure the 94 should be 28-30. The 7.4 has a different fuel pump than a 5.7.
6395, BHDF, 7.4 BBC lightly modded now 6395 BMHM back to BHDF
The problem existed when I bought the truck last week. I did the tune up and it still existed. Removed the IAC cleaned the bore and valve, problem still there. But a friend of mine told me the pintle should not move in/out freely.
Last night I drove it and at each stop sign, it stumbled, it did die once(5 stop signs)...but did stumble at every stop.
You can push and pull the pintle but it takes a little pressure. It won't just flop in and out with no pressure. Do you know when this problem started with the previous owner. Is it possible it started after the fuel pump change.
6395, BHDF, 7.4 BBC lightly modded now 6395 BMHM back to BHDF
I do not know when it started. They didnt give me much info. They were asking 1800 for the truck and I bought it the next day for 500 because they didnt want to pay for registration again in a few days. Yes the pintle just kinda flops around.
Just as a check I shook all the spares in the shop and non of the pintles move while shaking. The iac is 30-40 $ so with your good price it might be a cheap fix. My 2 bits would be for the 12mm. Also might still be a good idea to test fuel pressure.
6395, BHDF, 7.4 BBC lightly modded now 6395 BMHM back to BHDF
So, I pulled the TBI off the truck and found a few things. It seems to be a rebuilt TBI. An injector spacer was added to it, the injectors were sealed into the pod with silicone, the TPS 'gray' wire was corroded, and the return line nut was stripped. So I cleaned the gray wire and filled the connector with dielectric grease, replaced the IAC motor with Standard AC27, went to the wrecking yard and pulled a return line from a 5.7 truck. NOT THE SAME. I just cut off the nut, cut MY return line installed the new nut and flared both ends of the cuts and used a piece of 30r14 fuel hose to splice it back. After I replaced,cleaned and fixed everything, I took it for a drive. It stumbled once, but other than that, it ran great. I still want to check fuel pressure
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