87 TBI 350 K30 Running Problems
I'm just about stumped with the tools I have. I have an '87 Chevy K30 (V30) with a TBI 350 that is having problems. I bought it a bit over a year ago and did all kinds of maintenance work to it so it would be a good plow truck. All last winter it worked great except when I drove over a large snow pile and ripped the trans cooler lines off. This summer it sat mostly, until a friend used it to pull their hay wagon. Worked great for them too. I used it a couple more times to take trash to the dump. Then one day it started popping and died right after I pulled out of the driveway, acting like a fuel problem.
So right now, it will start and idle cold, the colder it is the longer it will idle without problems. It will usually idle as long as you let it, just purring right along. Revving it would cause a spit and then wind right up. It'll hold 4500 rpm no load and be as smooth as ever. As soon as I leave the driveway it pops and acts like it isn't getting any fuel, then dies. After it dies it is hard to restart, often firing and dieing right away. Once running again, it will idle just fine. If it sits a bit it will restart and idle fine.
New parts last year;
-Distributor (incl cap, rotor, pickup, ign mod)
-2" true Duals without Cats, with mufflers
EGR is blocked, Air pump removed, EVAP system bypassed (smog control all gone)
New parts this fall after problem started;
-Fuel Pressure Regulator
-Fuel Line from tank to Eng
-TPS (found dead spot)
Checked so far;
-Timing (mark still perfect and not bouncing)
-Fuel Pressure (constant 9psi even while it dies)
-MAP sensor output normal
-Eng Temp sensor output accurate
-Closed loop operation
I'll have a good long scan, but it won't let me attach it. But I can only scan while it's in the garage. The computer is not mobile. The last thing I did was replace the fuel line and add a T to check the fuel pressure.
I've been out of practice for 4 years, and my disability makes it difficult for me to do much work at once, or concentrate on what I'm doing clearly. So any ideas are welcome. I haven't worked on gassers, except my own, in 10 years. My own usually don't give me problems.
Help me figure this out before the real snow hits up North here.
2006 Chev K2500HD CC LB LBZ
- MBRP 4", Transgo Jr, Bilstein 5100s, PSC PS Pump, Ignition Override w/ High Idle
, DashDaq, Onboard Air & Bags, Bearclaw front Bumper, FASS 150 2005 Chev K3500 CC DRW LLY
Boss 9' V-Plow, 8' Dump Box
Last edited by ZiGBlazer; 12-27-2011 at 09:37 AM.