1988 V30 stock low mile big block, drivability issues...fuel? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**57NAPCO** · 12-13-2017, 07:28 AM

maybe someone can shed some light on this problem. My truck is just not running right and I wonder if I have a fuel pump problem. I’m throwing a service engine soon light ( off and on), sometimes a hard start ( starts stumbles and dies after a few times then it will finally start), it surges while driving, not the power it should have.

Cat is not plugged, fuel filter changed, new TPS and idle solenoid.

My question, would a bad fuel pump cause these symptons?

Thanks

cadillac_al · 12-13-2017, 09:18 AM

Check for codes and see what that service engine light is about. It should lead you in the right direction.

Alex V. · 12-13-2017, 11:51 AM

Being an '88 it'll be OBD-I which can be easier to just start testing with a multimeter than try to find someone with a scanner for it. Just from the OP's description I'd check for vacuum leaks before going any further.

**57NAPCO** · 12-15-2017, 01:21 PM

Thanks

, out of town at the moment but when I return I’ll check some stuff.

**truckdude239** · 12-16-2017, 10:28 AM

You can jump the obd1 port to get the engine light to flash the codes

**truckdude239** · 12-16-2017, 10:29 AM

https://www.youtube.com/watch?v=UIKdbTFvyUU

**57NAPCO** · 12-22-2017, 04:52 PM

Finally got a chance to head over to the garage, jumpered terminals a-b, got the 12, three times and then 44 three times and that was it. So I have a code 44 “lean exhaust indication”
Took the EGR off and it moves freely.

95 S_Trucker · 12-22-2017, 05:51 PM

Either too much air, or not enough fuel. Check for vacuum leaks, then check for fuel pressure.

My gut instinct tells me you have a split hose in the fuel tank. How many fuel tanks does your truck have? Does this problem only occur when using one tank? or both?

Tiger Joe · 12-22-2017, 06:55 PM

Could be fuel pressure regulator(too low) injector issue.

Or I just googled and found someone had same issues as you it was the IAC

**57NAPCO** · 12-23-2017, 08:56 AM

This is interesting...
https://www.justanswer.com/gmc/6lrx9...rop-start.html

Think I’m going to drop the tanks.

Truck ran fine off both tanks for a year or so after purchase (5 years ago) Eventuly one tank started to give me problems as mentioned above so I just ran off the other tank. After a thousand miles or so the other tank gave me problems, the truck has 19,000 original miles on it.

**57NAPCO** · 12-24-2017, 07:33 PM

Pulled the tank today, the rubber hose from the pump to the pickup tube had a hole, installed new pump and sock, done. Runs great!!

Thanks y’all and Merry Christmas!

**57NAPCO** · 12-26-2017, 03:24 PM

Since it’s now running great my idle is to high, going to replace the TBI base gasket first and see how it behaves.

On a side note, those plastic tank guards that cover the tank underneath cause a big problem with your tank rusting out, in my opinion.

12-13-2017, 07:28 AM	#1
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	1988 V30 stock low mile big block, drivability issues...fuel? maybe someone can shed some light on this problem. My truck is just not running right and I wonder if I have a fuel pump problem. I’m throwing a service engine soon light ( off and on), sometimes a hard start ( starts stumbles and dies after a few times then it will finally start), it surges while driving, not the power it should have. Cat is not plugged, fuel filter changed, new TPS and idle solenoid. My question, would a bad fuel pump cause these symptons? Thanks

12-13-2017, 09:18 AM	#2
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,334	Re: 1988 V30 stock low mile big block, drivability issues...fuel? Check for codes and see what that service engine light is about. It should lead you in the right direction. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

12-13-2017, 11:51 AM	#3
Alex V. Registered User Join Date: Mar 2013 Location: Campbellsville, KY Posts: 888	Re: 1988 V30 stock low mile big block, drivability issues...fuel? Being an '88 it'll be OBD-I which can be easier to just start testing with a multimeter than try to find someone with a scanner for it. Just from the OP's description I'd check for vacuum leaks before going any further. __________________ Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue.

12-15-2017, 01:21 PM	#4
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1988 V30 stock low mile big block, drivability issues...fuel? Thanks , out of town at the moment but when I return I’ll check some stuff.

12-16-2017, 10:28 AM	#5
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: 1988 V30 stock low mile big block, drivability issues...fuel? You can jump the obd1 port to get the engine light to flash the codes __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-16-2017, 10:29 AM	#6
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,217	Re: 1988 V30 stock low mile big block, drivability issues...fuel? https://www.youtube.com/watch?v=UIKdbTFvyUU __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

12-22-2017, 04:52 PM	#7
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1988 V30 stock low mile big block, drivability issues...fuel? Finally got a chance to head over to the garage, jumpered terminals a-b, got the 12, three times and then 44 three times and that was it. So I have a code 44 “lean exhaust indication” Took the EGR off and it moves freely.

12-22-2017, 05:51 PM	#8
95 S_Trucker Registered User Join Date: Oct 2009 Location: . Posts: 2,178	Re: 1988 V30 stock low mile big block, drivability issues...fuel? Either too much air, or not enough fuel. Check for vacuum leaks, then check for fuel pressure. My gut instinct tells me you have a split hose in the fuel tank. How many fuel tanks does your truck have? Does this problem only occur when using one tank? or both?

12-22-2017, 06:55 PM	#9
Tiger Joe Registered User Join Date: Mar 2015 Location: South of Pittsburgh Posts: 425	Re: 1988 V30 stock low mile big block, drivability issues...fuel? Could be fuel pressure regulator(too low) injector issue. Or I just googled and found someone had same issues as you it was the IAC

12-23-2017, 08:56 AM	#10
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1988 V30 stock low mile big block, drivability issues...fuel? This is interesting... https://www.justanswer.com/gmc/6lrx9...rop-start.html Think I’m going to drop the tanks. Truck ran fine off both tanks for a year or so after purchase (5 years ago) Eventuly one tank started to give me problems as mentioned above so I just ran off the other tank. After a thousand miles or so the other tank gave me problems, the truck has 19,000 original miles on it.

12-24-2017, 07:33 PM	#11
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1988 V30 stock low mile big block, drivability issues...fuel? Pulled the tank today, the rubber hose from the pump to the pickup tube had a hole, installed new pump and sock, done. Runs great!! Thanks y’all and Merry Christmas!

12-26-2017, 03:24 PM	#12
57NAPCO F’B’D guy Join Date: Feb 2004 Location: Texas/Maine Posts: 2,208	Re: 1988 V30 stock low mile big block, drivability issues...fuel? Since it’s now running great my idle is to high, going to replace the TBI base gasket first and see how it behaves. On a side note, those plastic tank guards that cover the tank underneath cause a big problem with your tank rusting out, in my opinion.



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