88 V10 Suburban problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Sgt_solo · 06-11-2016, 01:09 PM

I have an 88 V10 Sub, Silverado, with the 350 TBI, 700r4 trans. I've already replaced the disributor, rotor, cap, wire, plugs, ECM, fuel pump, fuel relay, starter, battery, cables, radiator, water pump, thermostat. When I drive at highway speeds and slow down it stalls out, then will stall every time I slow down. I've heard of the 700 having a TCC problem, how do I check that? Is there anything else I can check? Pictures help. Thanks.

ChevyTech · 06-11-2016, 10:52 PM

Welcome to the board!

If the transmission torque converter was staying locked, it will cause a stall, but not until the vehicle comes to a stop, or nearly stopped. Slowing down, it would not cause the engine to die.

It sounds like your vehicle could have an EGR valve that is sticking open. Disconnect and plug the vacuum hose going to the EGR valve and take it on a test drive and see if the problem goes away. Driving without the EGR working will set a trouble code if you drive it long enough that way.

Sgt_solo · 06-11-2016, 10:58 PM

What's an EGR? And how do I check it? I'm not a gear head lol, I learn things as they break.

ChevyTech · 06-11-2016, 11:31 PM

Photo with identification labels:
http://67-72chevytrucks.com/vboard/s...7&postcount=11

Threads with EGR discussion:
http://67-72chevytrucks.com/vboard/s...d.php?t=347247

http://67-72chevytrucks.com/vboard/s...d.php?t=348308

EGR testing write up:
http://www.chevytalk.org/fusionbb/sh...php?tid/258416

Sgt_solo · 06-19-2016, 09:31 PM

I'm replacing my EGR valve, seloniod, and the thermal vacuum switch. My question is on the seloniod the side that connects to the EGR valve is empty, is there anything that is suppose to connect there or do I need to cap it?

Sgt_solo · 06-20-2016, 08:34 AM

Sorry I wasn't very clear, the side that connects to the EGR valve has two stems, the bottom one goes to the EGR and the top is just open. Does that top one need capped?

GM-power · 06-20-2016, 01:54 PM

It's a vent, don't cap it off.

ChevyTech · 06-20-2016, 10:52 PM

GM-power is correct.

Do not cap the vent port.

Make sure you put the hose on the correct port.

06-11-2016, 01:09 PM	#1
Sgt_solo Registered User Join Date: Jun 2016 Location: Austin, TX Posts: 6	88 V10 Suburban problems I have an 88 V10 Sub, Silverado, with the 350 TBI, 700r4 trans. I've already replaced the disributor, rotor, cap, wire, plugs, ECM, fuel pump, fuel relay, starter, battery, cables, radiator, water pump, thermostat. When I drive at highway speeds and slow down it stalls out, then will stall every time I slow down. I've heard of the 700 having a TCC problem, how do I check that? Is there anything else I can check? Pictures help. Thanks.

06-11-2016, 10:52 PM	#2
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: 88 V10 Suburban problems Welcome to the board! If the transmission torque converter was staying locked, it will cause a stall, but not until the vehicle comes to a stop, or nearly stopped. Slowing down, it would not cause the engine to die. It sounds like your vehicle could have an EGR valve that is sticking open. Disconnect and plug the vacuum hose going to the EGR valve and take it on a test drive and see if the problem goes away. Driving without the EGR working will set a trouble code if you drive it long enough that way. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.

06-11-2016, 10:58 PM	#3
Sgt_solo Registered User Join Date: Jun 2016 Location: Austin, TX Posts: 6	Re: 88 V10 Suburban problems What's an EGR? And how do I check it? I'm not a gear head lol, I learn things as they break.

06-11-2016, 11:31 PM	#4
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: 88 V10 Suburban problems Photo with identification labels: http://67-72chevytrucks.com/vboard/s...7&postcount=11 Threads with EGR discussion: http://67-72chevytrucks.com/vboard/s...d.php?t=347247 http://67-72chevytrucks.com/vboard/s...d.php?t=348308 EGR testing write up: http://www.chevytalk.org/fusionbb/sh...php?tid/258416 __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. Last edited by ChevyTech; 06-11-2016 at 11:36 PM.

06-19-2016, 09:31 PM	#5
Sgt_solo Registered User Join Date: Jun 2016 Location: Austin, TX Posts: 6	Re: 88 V10 Suburban problems I'm replacing my EGR valve, seloniod, and the thermal vacuum switch. My question is on the seloniod the side that connects to the EGR valve is empty, is there anything that is suppose to connect there or do I need to cap it?

06-20-2016, 08:34 AM	#6
Sgt_solo Registered User Join Date: Jun 2016 Location: Austin, TX Posts: 6	Re: 88 V10 Suburban problems Sorry I wasn't very clear, the side that connects to the EGR valve has two stems, the bottom one goes to the EGR and the top is just open. Does that top one need capped?

06-20-2016, 01:54 PM	#7
GM-power Registered User Join Date: Mar 2012 Location: Little Rock, Arkansas Posts: 770	Re: 88 V10 Suburban problems It's a vent, don't cap it off. __________________ 1979 Sierra Classic Heavy-half 1996 Silverado x-cab "the daily"

06-20-2016, 10:52 PM	#8
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: 88 V10 Suburban problems GM-power is correct. Do not cap the vent port. Make sure you put the hose on the correct port. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.

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