T350 issue?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jescates · 10-11-2016, 05:23 PM

Drove the truck Saturday, at 50mph, truck felt like it was surging. Went to get on the interstate and it would only get up to 65, still surging. Got off at the next exit and at 50, it seemed fine. Stopped at Wal-Mart, then hit the road. Truck drove flawlessly! Put about 100 miles on it Sunday and Monday with no issues. Drove it to work today and no problems. Then on the ride home, did 70mph, but started feeling a little surge. So took an early exit, and the truck would barely get up to 40 on the back roads. Checked the fluids and it's a little above the full mark. I plan on changing the filter soon, but just wondering if an overfill would cause the surging or am I looking at possibly bigger problems? The transmission was rebuilt in 2004, but it has sat for the last five years.

**Boog** · 10-11-2016, 05:39 PM

I'd look at the fuel filter first.

**Ironangel** · 10-11-2016, 05:43 PM

Quote:

Originally Posted by Boog

I'd look at the fuel filter first.

Yup, what he said...

jescates · 10-11-2016, 05:56 PM

I will check it, but a month ago, I changed out the sending unit, emptied the tank and flushed it out, put new filter in. Even blew out the fuel lines! It's running fine other than the intermittent surge. As I was driving it, I kicked into neutral and revved the engine and it doesn't stumble at all. But, hey, fuel filters are cheap, so I will try that!

custom10nut · 10-11-2016, 06:14 PM

What carb are you running? Rochester has the internal filter the may be the issue. If it was transmission, you'd be getting t he same symptoms every time as the truck heats up.

jescates · 10-11-2016, 06:16 PM

It's an Edelbrock 1406.

custom10nut · 10-11-2016, 06:49 PM

Have you tuned it to your engine? They come Crome the maker set up lean, for a 305, so if you're running bigger with higher compression, then a lean condition is quite possibly your problem. It's a real easy fix, with springs, jets, and metering rods. Also check your electric choke setting.

jescates · 10-11-2016, 08:36 PM

The carb was on the truck when I bought 13 years ago, so I haven't done anything to it! It's been parked for a long time, hence changing out everything fuel related with exception of carb and fuel pump. Since its intermittent, so far, I was thinking something had clogged up the transmission filter. When driving, and it starts that surging, I can floor it and the engine seems like it's trying to rev up, it just doesn't seem to transfer those rpm's to the rear end! I am going to replace the fuel filter and the transmission filter this weekend and see!

geezer#99 · 10-11-2016, 08:53 PM

Check your timing first!

**Ironangel** · 10-11-2016, 09:19 PM

Yup, check that timing and run some SeaFoam through that carb. Surging is indicative of a lean condition and if she's been sitting awhile you can bet that stuff called gasolie has deteriorated and mix that with a lean out of the box Edlebrock carb? Probably starvin for some real life 87 pure high test...Might run an inline filter between the pump and the carb once the carb proves clean...~Ghostrider~

custom10nut · 10-11-2016, 10:02 PM

Another thing to look at is your accelerator pump, and needle and seat. in the carb. At 13 years old there's a possibility that it's gunned up from all this "quaiity" fuel being sold these days. The Ethanol with start to break apart into its separate chemicals after about 30 days. This is why small engine manufacturers highly recommend non-ethanol fuel

10-11-2016, 05:23 PM	#1
jescates Registered User Join Date: Aug 2001 Location: Mcloud, Oklahoma Posts: 656	T350 issue?? Drove the truck Saturday, at 50mph, truck felt like it was surging. Went to get on the interstate and it would only get up to 65, still surging. Got off at the next exit and at 50, it seemed fine. Stopped at Wal-Mart, then hit the road. Truck drove flawlessly! Put about 100 miles on it Sunday and Monday with no issues. Drove it to work today and no problems. Then on the ride home, did 70mph, but started feeling a little surge. So took an early exit, and the truck would barely get up to 40 on the back roads. Checked the fluids and it's a little above the full mark. I plan on changing the filter soon, but just wondering if an overfill would cause the surging or am I looking at possibly bigger problems? The transmission was rebuilt in 2004, but it has sat for the last five years. __________________ 1970 C-10 LWB 1998 Jeep Wrangled TJ 2009 Honda VTX 1300 2013 Buick Enclave

10-11-2016, 05:39 PM	#2
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,095	Re: T350 issue?? I'd look at the fuel filter first. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

10-11-2016, 05:56 PM	#4
jescates Registered User Join Date: Aug 2001 Location: Mcloud, Oklahoma Posts: 656	Re: T350 issue?? I will check it, but a month ago, I changed out the sending unit, emptied the tank and flushed it out, put new filter in. Even blew out the fuel lines! It's running fine other than the intermittent surge. As I was driving it, I kicked into neutral and revved the engine and it doesn't stumble at all. But, hey, fuel filters are cheap, so I will try that! __________________ 1970 C-10 LWB 1998 Jeep Wrangled TJ 2009 Honda VTX 1300 2013 Buick Enclave

10-11-2016, 06:14 PM	#5
custom10nut Registered User Join Date: Apr 2015 Location: East Tn (In the heart of the Smoky Mtns) Posts: 1,859	Re: T350 issue?? What carb are you running? Rochester has the internal filter the may be the issue. If it was transmission, you'd be getting t he same symptoms every time as the truck heats up.

10-11-2016, 06:16 PM	#6
jescates Registered User Join Date: Aug 2001 Location: Mcloud, Oklahoma Posts: 656	Re: T350 issue?? It's an Edelbrock 1406. __________________ 1970 C-10 LWB 1998 Jeep Wrangled TJ 2009 Honda VTX 1300 2013 Buick Enclave

10-11-2016, 06:49 PM	#7
custom10nut Registered User Join Date: Apr 2015 Location: East Tn (In the heart of the Smoky Mtns) Posts: 1,859	Re: T350 issue?? Have you tuned it to your engine? They come Crome the maker set up lean, for a 305, so if you're running bigger with higher compression, then a lean condition is quite possibly your problem. It's a real easy fix, with springs, jets, and metering rods. Also check your electric choke setting.

10-11-2016, 08:36 PM	#8
jescates Registered User Join Date: Aug 2001 Location: Mcloud, Oklahoma Posts: 656	Re: T350 issue?? The carb was on the truck when I bought 13 years ago, so I haven't done anything to it! It's been parked for a long time, hence changing out everything fuel related with exception of carb and fuel pump. Since its intermittent, so far, I was thinking something had clogged up the transmission filter. When driving, and it starts that surging, I can floor it and the engine seems like it's trying to rev up, it just doesn't seem to transfer those rpm's to the rear end! I am going to replace the fuel filter and the transmission filter this weekend and see! __________________ 1970 C-10 LWB 1998 Jeep Wrangled TJ 2009 Honda VTX 1300 2013 Buick Enclave

10-11-2016, 08:53 PM	#9
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,542	Re: T350 issue?? Check your timing first!

10-11-2016, 09:19 PM	#10
Ironangel Senior Member Join Date: Feb 2010 Location: Falls City, Nebraska "100 Miles From Nowhere" Posts: 2,219	Re: T350 issue?? Yup, check that timing and run some SeaFoam through that carb. Surging is indicative of a lean condition and if she's been sitting awhile you can bet that stuff called gasolie has deteriorated and mix that with a lean out of the box Edlebrock carb? Probably starvin for some real life 87 pure high test...Might run an inline filter between the pump and the carb once the carb proves clean...~Ghostrider~ __________________ Michael of the clan Hill, "Two Seventy Two's" 71 1-ton Dually 350 4-Speed 71 C/50 Grain Truck, 350 Split-Axle 4-Speed 02 3/4 ton Express 14 Indian Chief Vintage 1952 Ford 8N, "Only Ford Allowed On The Property" "Be American, Buy American"

10-11-2016, 10:02 PM	#11
custom10nut Registered User Join Date: Apr 2015 Location: East Tn (In the heart of the Smoky Mtns) Posts: 1,859	Re: T350 issue?? Another thing to look at is your accelerator pump, and needle and seat. in the carb. At 13 years old there's a possibility that it's gunned up from all this "quaiity" fuel being sold these days. The Ethanol with start to break apart into its separate chemicals after about 30 days. This is why small engine manufacturers highly recommend non-ethanol fuel



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