1987 R10 w/ Factory TBI Stumbles and Dies when Hot - The 1947 - Present Chevrolet & GMC Truck Message Board Network

jrblanke · 01-29-2018, 10:36 AM

1987 R10 w/ factory TBI stumbles when hot.

Question regarding a friend’s 1987 R10 long bed. The truck cold starts fine, but when it gets hot it is difficult to start. Once its hot it takes longer to fire, and when it does fire, it will die when he shifts it into drive.

Is this a common problem? Is there anything in particular to look for when doing a tune up? As said on the title, the truck has factory fuel injection and is completely stock.

xs-style · 01-29-2018, 02:06 PM

Replace the fuel filter. If your doing a tune up anyway, 6 bucks is a small price to pay for an item that's often forgotten or plain old skipped over. Also go to your local harbor freight and get a fuel pressure tester , a vacuum tester, and a multimeter. They run about 15 bucks each. Fuel delivery problems or vacuum issues are normally the cause of what your describing.

Tiger Joe · 01-29-2018, 02:18 PM

x2 start with fuel filter. I had similar issues with my 87 tbi- stumbling at idle and die when shifting into park, and a new fuel filter fixed it

Desert1957 · 01-30-2018, 10:53 AM

Quote:

Originally Posted by tiger joe

x2 start with fuel filter. I had similar issues with my 87 tbi- stumbling at idle and die when shifting into park, and a new fuel filter fixed it

x3

jrblanke · 01-30-2018, 03:40 PM

The fuel filter was recently replaced. It starts right up idles fine when cold but stumbles and is difficult to start when hot. Once it’s started it has plenty of power throughout the rpm range.
Posted via Mobile Device

xs-style · 01-30-2018, 03:45 PM

Pull the starter and have it tested. They can heat soak if not properly shielded, especially with age. Your local AutoZone can do it. Have them run the test a few times so it gets warm. On the same trip you could take the ignition control module. It can be tested as well. Same deal, ask them to run the test a few times so it gets warm.

jrblanke · 01-30-2018, 04:45 PM

Quote:

Originally Posted by xs-style

Pull the starter and have it tested. They can heat soak if not properly shielded, especially with age. Your local AutoZone can do it. Have them run the test a few times so it gets warm. On the same trip you could take the ignition control module. It can be tested as well. Same deal, ask them to run the test a few times so it gets warm.

I am not familiar with the term heat soak, but the truck isn't having a hard time turning over. It seems like either a spark or fuel issue. I assume that it is a fuel issue since the truck runs fine. Is there a fuel check valve or something that is malfunctioning when the engine is hot?

xs-style · 01-30-2018, 07:33 PM

There's no fuel check valve or anything. But like I say, have that ignition control module tested. A wells tester puts it under normal operating load. If it gets hot and fails the wells test, you'll know that component is bad.

cadillac_al · 01-31-2018, 10:08 AM

I'd say if there are no codes it must be a fuel pump going bad or the fuel filter.

v30crewcab · 02-01-2018, 10:26 AM

sounds like the coil is messing up when it gets warm. other possibility is the distributor is worn. we had one that would randomly shut off when running. distributor fixed it.

D13 · 02-01-2018, 02:29 PM

Classic symptom of coil or weak ignition module. Check for good hot spark while cranking.

jrblanke · 02-02-2018, 08:12 AM

Thanks guys, Sounds like we have some things to check. I appreciate the help! I'll report back once we get a chance to work on it some more.

blakerj10 · 02-05-2018, 06:50 PM

My blazer was doing something similar. Died on me about 5 or 6 times in about 6 months. Would restart after cooling off a bit. Then it died and would not restart. Took ignition module out of distributor (youtube video out there). Autozone can test them. Popped new one in and runs better than anytime since I have had it.

01-29-2018, 10:36 AM	#1
jrblanke Registered User Join Date: May 2011 Location: Raleigh, NC Posts: 240	1987 R10 w/ Factory TBI Stumbles and Dies when Hot 1987 R10 w/ factory TBI stumbles when hot. Question regarding a friend’s 1987 R10 long bed. The truck cold starts fine, but when it gets hot it is difficult to start. Once its hot it takes longer to fire, and when it does fire, it will die when he shifts it into drive. Is this a common problem? Is there anything in particular to look for when doing a tune up? As said on the title, the truck has factory fuel injection and is completely stock.

01-29-2018, 02:06 PM	#2
xs-style Registered User Join Date: Mar 2008 Location: Lawndale, NC Posts: 658	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot Replace the fuel filter. If your doing a tune up anyway, 6 bucks is a small price to pay for an item that's often forgotten or plain old skipped over. Also go to your local harbor freight and get a fuel pressure tester , a vacuum tester, and a multimeter. They run about 15 bucks each. Fuel delivery problems or vacuum issues are normally the cause of what your describing. __________________ 1978 Scottsdale - celebrating 10 years of teaching me profanity 1990 Silverado - bought in Nov. 2016 and it's already catching up - Sold 1987 k5 blazer - sold... :\ seed money for the 81 1981 k20 4x4 - 5.3 swap in progress Events attended: Spring GOG 2011 Dale JR car show Summer 2012 Gathering at Tommys pickup parts

01-29-2018, 02:18 PM	#3
Tiger Joe Registered User Join Date: Mar 2015 Location: South of Pittsburgh Posts: 428	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot x2 start with fuel filter. I had similar issues with my 87 tbi- stumbling at idle and die when shifting into park, and a new fuel filter fixed it

01-30-2018, 03:40 PM	#5
jrblanke Registered User Join Date: May 2011 Location: Raleigh, NC Posts: 240	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot The fuel filter was recently replaced. It starts right up idles fine when cold but stumbles and is difficult to start when hot. Once it’s started it has plenty of power throughout the rpm range. Posted via Mobile Device

01-30-2018, 03:45 PM	#6
xs-style Registered User Join Date: Mar 2008 Location: Lawndale, NC Posts: 658	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot Pull the starter and have it tested. They can heat soak if not properly shielded, especially with age. Your local AutoZone can do it. Have them run the test a few times so it gets warm. On the same trip you could take the ignition control module. It can be tested as well. Same deal, ask them to run the test a few times so it gets warm. __________________ 1978 Scottsdale - celebrating 10 years of teaching me profanity 1990 Silverado - bought in Nov. 2016 and it's already catching up - Sold 1987 k5 blazer - sold... :\ seed money for the 81 1981 k20 4x4 - 5.3 swap in progress Events attended: Spring GOG 2011 Dale JR car show Summer 2012 Gathering at Tommys pickup parts

01-30-2018, 07:33 PM	#8
xs-style Registered User Join Date: Mar 2008 Location: Lawndale, NC Posts: 658	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot There's no fuel check valve or anything. But like I say, have that ignition control module tested. A wells tester puts it under normal operating load. If it gets hot and fails the wells test, you'll know that component is bad. __________________ 1978 Scottsdale - celebrating 10 years of teaching me profanity 1990 Silverado - bought in Nov. 2016 and it's already catching up - Sold 1987 k5 blazer - sold... :\ seed money for the 81 1981 k20 4x4 - 5.3 swap in progress Events attended: Spring GOG 2011 Dale JR car show Summer 2012 Gathering at Tommys pickup parts

01-31-2018, 10:08 AM	#9
cadillac_al Registered User Join Date: Oct 2013 Location: Maine Posts: 2,375	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot I'd say if there are no codes it must be a fuel pump going bad or the fuel filter. __________________ 76 Chevy K20 76 GMC K15 77 Chevy C10 77 Chevy K10

02-01-2018, 10:26 AM	#10
v30crewcab Registered User Join Date: Apr 2012 Location: Chatt Tn Posts: 982	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot sounds like the coil is messing up when it gets warm. other possibility is the distributor is worn. we had one that would randomly shut off when running. distributor fixed it. __________________ 88 military v30 crewcab shortbed 5.9 cummins, nv4500, 205 86 k30, 89 diesel burb, 76 gmc pathfinder 71 longbed 5.3 4l80 http://67-72chevytrucks.com/vboard/s...d.php?t=522535

02-01-2018, 02:29 PM	#11
D13 Registered User Join Date: Feb 2007 Location: Memphis MI Posts: 1,851	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot Classic symptom of coil or weak ignition module. Check for good hot spark while cranking. __________________ 1987 2 ton 1982 250/TH350 beater in progress Dad's 1981 3/4 L6 3 on tree posi and no options, awaiting restoration or scrapping Plus a mess o' tractors

02-02-2018, 08:12 AM	#12
jrblanke Registered User Join Date: May 2011 Location: Raleigh, NC Posts: 240	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot Thanks guys, Sounds like we have some things to check. I appreciate the help! I'll report back once we get a chance to work on it some more.

02-05-2018, 06:50 PM	#13
blakerj10 Registered User Join Date: Apr 2008 Location: Gillette, WY Posts: 16	Re: 1987 R10 w/ Factory TBI Stumbles and Dies when Hot My blazer was doing something similar. Died on me about 5 or 6 times in about 6 months. Would restart after cooling off a bit. Then it died and would not restart. Took ignition module out of distributor (youtube video out there). Autozone can test them. Popped new one in and runs better than anytime since I have had it.



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