ChrisAU
Full Access Member
'92 K1500 5.7L TBI
So yesterday I drive about 12 miles this afternoon on the way to get my rear ranch hand bumper (a long trip for this truck), and at the red light going to the freight terminal I notice a sort of reverse idle surge; it's not a rough idle, it just got low quickly and then bounced quickly back to normal a few times, takes no more than 2 seconds. Then I pull up to the gate and I notice it doing it again, then as I'm waiting for it to open it stalls. And it was a hard start, took 4-5 attempts. You can hear it turning over it just doesn't crank. Then it fires up, runs great. So we throw the bumper in the back of the truck and on the way home I notice the low surge so I start driving with two feet. We get back home and when I put the truck in reverse to park it immediately stalls again. And again, its a very hard start.
The truck has been stumbling a bit at start-up until it warms up. I just don't drive this truck enough at all to describe behavior differences.
Anybody got a clue?
New parts: plugs, wires, cap, rotor, distributor, spark control module, EGR valve, EGR valve solenoid, TPS, MAP sensor, O2 sensor, ignition control module, pick-up coil, IAC Valve, CTS, knock sensor (& pigtail), intake gaskets, and prob some more, all within the last 500 miles.
Discussion on GMT400 has me thinking I need a TB rebuild...I have a kit, just haven't gotten around to doing it. Fuel pressure is steady high, like 15-16 PSI. Could it be leaking FPR and/or injectors? I have steady fuel from both injectors, it just isn't anything close to a "mist" and the hard starting does feel like a flooded carb.
I ordered two new Delphi injectors this morning.
The kit I have is just like this:
I've never been in one of these TB's before, but is that all I need? Are there replacements for the actual pressure regulator available?
Please help!
So yesterday I drive about 12 miles this afternoon on the way to get my rear ranch hand bumper (a long trip for this truck), and at the red light going to the freight terminal I notice a sort of reverse idle surge; it's not a rough idle, it just got low quickly and then bounced quickly back to normal a few times, takes no more than 2 seconds. Then I pull up to the gate and I notice it doing it again, then as I'm waiting for it to open it stalls. And it was a hard start, took 4-5 attempts. You can hear it turning over it just doesn't crank. Then it fires up, runs great. So we throw the bumper in the back of the truck and on the way home I notice the low surge so I start driving with two feet. We get back home and when I put the truck in reverse to park it immediately stalls again. And again, its a very hard start.
The truck has been stumbling a bit at start-up until it warms up. I just don't drive this truck enough at all to describe behavior differences.
Anybody got a clue?
New parts: plugs, wires, cap, rotor, distributor, spark control module, EGR valve, EGR valve solenoid, TPS, MAP sensor, O2 sensor, ignition control module, pick-up coil, IAC Valve, CTS, knock sensor (& pigtail), intake gaskets, and prob some more, all within the last 500 miles.
Discussion on GMT400 has me thinking I need a TB rebuild...I have a kit, just haven't gotten around to doing it. Fuel pressure is steady high, like 15-16 PSI. Could it be leaking FPR and/or injectors? I have steady fuel from both injectors, it just isn't anything close to a "mist" and the hard starting does feel like a flooded carb.
I ordered two new Delphi injectors this morning.
The kit I have is just like this:
I've never been in one of these TB's before, but is that all I need? Are there replacements for the actual pressure regulator available?
Please help!
