kolton5543
Junior Member
- Joined
- Jul 8, 2016
- Posts
- 8
- Reaction score
- 0
- Location
- Safford, AZ
- First Name
- Kolton
- Truck Year
- 1974
- Truck Model
- k10
- Engine Size
- 350
Hey guys. I'm new to the Forum here. I've been having issues with my truck and was going through some threads. I couldn't see pictures until I made an account. I figured since I now have an account I may as well make a thread on my problem. So here it is.
My truck is a 1974 k10. It has a 350 700r4 and np203. The story of this truck is a long one so to keep it short I had originally installed a 305 from a '92 caprice and used all of the TBI and serpentine stuff. I used only the minimum needed sensors which include the CTS, IAC, Knock, IAT, TPS, Dizzy, ESC, MAP. Ihink that is it. No O2 or vss. Not the best but still functional. The truck did good until the 305 broke a ring. I replaced it with a rebuilt '93 350 bottom end from a c2500 and retained the 305 heads. I replaced the intake manifold with the '93 c2500 intake because it fit the truck better and I had to use the '93 dizzy also. the truck ran good and never let me down until it got wet.
With the 305 it was perfectly fine. With the 350 the first time I hit a water hole it stalled. It eventually got it to run but it would idle for a little bit then surge then stall. It would always fire up immediately after though and repeat the process. I managed to get back home by restarting the engine when it would start to surge. It sat for a couple of days then it worked fine till recently. I never knew what caused it. Last week I decided to hit some mud holes and again the first hole I hit it stalled. After about 30 minutes it started and ran good again. Hit a couple more holes and eventually it stalled again. this time it continued to not want to run. first it didn't start. eventually it would fire but immediately die. Soon it ran but ran bad and surged. Finally it ran but idled high and had a bad miss fire at idle. It went down the highway good though and did 75. I left it parked for a couple days and it did what it did the first time i hit water and would just surge then stalled. It sat for a couple more days and it now wont start.
I played with it a bunch and haven't gotten it to run. Iv'e narrowed it down to no injector pulse at the ECM. I haven't thrown any money at it yet but I have a lot of spare parts so I've tried them. I've tried a new TPS, MAP, ESC, Coil (though its fuel related) and ignition module. I've checked the plugs at the ECM and cleaned them thoroughly. I can make the injectors fire by applying ground at the injector wire on the ECM connector. The only things I haven't tried changing yet/don't have spares of is the ecm and distributor. If I don't think its the pick up coil because I still have good spark and it runs good when I hand feed it fuel. I don't think it will cause no fuel but still have spark like a module will. Of the things I've swapped the TPS is the only part i am unsure of condition. Everything else I am positive worked.
Should I get the DMM out and start checking wiring now or is there something else I should also be looking at before trying a new ECM. I have fuel pressure around 13 psi with an adjustable regulator from 0 to 120 psi. Remember the only thing that's changed since the 305 is the short block, intake manifold, and dizzy. Everything else is the same.
My truck is a 1974 k10. It has a 350 700r4 and np203. The story of this truck is a long one so to keep it short I had originally installed a 305 from a '92 caprice and used all of the TBI and serpentine stuff. I used only the minimum needed sensors which include the CTS, IAC, Knock, IAT, TPS, Dizzy, ESC, MAP. Ihink that is it. No O2 or vss. Not the best but still functional. The truck did good until the 305 broke a ring. I replaced it with a rebuilt '93 350 bottom end from a c2500 and retained the 305 heads. I replaced the intake manifold with the '93 c2500 intake because it fit the truck better and I had to use the '93 dizzy also. the truck ran good and never let me down until it got wet.
With the 305 it was perfectly fine. With the 350 the first time I hit a water hole it stalled. It eventually got it to run but it would idle for a little bit then surge then stall. It would always fire up immediately after though and repeat the process. I managed to get back home by restarting the engine when it would start to surge. It sat for a couple of days then it worked fine till recently. I never knew what caused it. Last week I decided to hit some mud holes and again the first hole I hit it stalled. After about 30 minutes it started and ran good again. Hit a couple more holes and eventually it stalled again. this time it continued to not want to run. first it didn't start. eventually it would fire but immediately die. Soon it ran but ran bad and surged. Finally it ran but idled high and had a bad miss fire at idle. It went down the highway good though and did 75. I left it parked for a couple days and it did what it did the first time i hit water and would just surge then stalled. It sat for a couple more days and it now wont start.
I played with it a bunch and haven't gotten it to run. Iv'e narrowed it down to no injector pulse at the ECM. I haven't thrown any money at it yet but I have a lot of spare parts so I've tried them. I've tried a new TPS, MAP, ESC, Coil (though its fuel related) and ignition module. I've checked the plugs at the ECM and cleaned them thoroughly. I can make the injectors fire by applying ground at the injector wire on the ECM connector. The only things I haven't tried changing yet/don't have spares of is the ecm and distributor. If I don't think its the pick up coil because I still have good spark and it runs good when I hand feed it fuel. I don't think it will cause no fuel but still have spark like a module will. Of the things I've swapped the TPS is the only part i am unsure of condition. Everything else I am positive worked.
Should I get the DMM out and start checking wiring now or is there something else I should also be looking at before trying a new ECM. I have fuel pressure around 13 psi with an adjustable regulator from 0 to 120 psi. Remember the only thing that's changed since the 305 is the short block, intake manifold, and dizzy. Everything else is the same.
