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1992 GMC TrailMaster Revs, Idles and then will die


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megan22013
Novice

May 14, 2013, 4:56 PM

Post #1 of 14 (1613 views)
1992 GMC TrailMaster Revs, Idles and then will die Sign In

This truck is a 1992 GMC TrailMaster. It has about 53,600 miles. My mom went to sell the truck and it was running perfectly. After someone took it for a test, it now turns on but the engine will rev. There is an odd sound when the engine revs. We have taken it to a mechanic but since it is a 1992 he did not have the capability of hooking it up to see what codes come on. It had to be towed because after trying to drive it not even a mile, it died. The truck has the original engine, the check engine light does not come on and the mechanic who looked at it believes there is nothing wrong with the engine itself. I'm wondering what could cause the truck to sound like this so suddenly, when it had been driving perfectly fine. I have a video of what it looks and sounds like under the hood that I won't post. If someone would like to see it to get a better understanding, I can email it to you. Thank you.


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

May 14, 2013, 6:14 PM

Post #2 of 14 (1598 views)
Re: 1992 GMC TrailMaster Revs, Idles and then will die Sign In

Never heard of a TrailMaster.

Is this a truck, van, suburban?
Which series?
Which engine?
Which transmission?
2wd or 4wd?

If you want to post a link to your video, you can do that here.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 14, 2013, 6:15 PM)


megan22013
Novice

May 14, 2013, 7:12 PM

Post #3 of 14 (1579 views)
Re: 1992 GMC TrailMaster Revs, Idles and then will die Sign In

It's a GMC Sierra C1500. I believe it's a 5.0 Liter V8 engine. It's a 1/2 ton truck. Here is a link to the video:

http://www.youtube.com/watch?v=MavN7OB63Zc


(This post was edited by megan22013 on May 14, 2013, 7:55 PM)


megan22013
Novice

May 14, 2013, 7:44 PM

Post #4 of 14 (1570 views)
Re: 1992 GMC TrailMaster Revs, Idles and then will die Sign In

Any help is greatly appreciated!


(This post was edited by megan22013 on May 14, 2013, 7:55 PM)


Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

May 15, 2013, 5:03 AM

Post #5 of 14 (1547 views)
Re: 1992 GMC TrailMaster Revs, Idles and then will die Sign In

Have you checked for vacuum leaks? Inspect all the vacuum hoses.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 15, 2013, 5:14 AM

Post #6 of 14 (1546 views)
Re: 1992 GMC Sierra 5.0(?) Revs, Idles and then will die Sign In

Your mechanic can get codes with a paper clip on this and count blinks of check engine light - he/she just doesn't know that as it's quite old now.

The pre OBD2 codes you still had to take with a grain of salt as some clue if anything at all.

My real question is if this was running perfectly before this test drive did anyone go along with it to see how it was treated or if potential buyer really abused it in a test run? Stuff can happen anytime for no particular reason of course. It can also be a bit scary selling your own vehicle (privately) to strangers really for many folks,

T



megan22013
Novice

May 15, 2013, 7:07 AM

Post #7 of 14 (1527 views)
Re: 1992 GMC Sierra 5.0(?) Revs, Idles and then will die Sign In

My mom did not go along, so we do not know if the person who drove the truck did anything to it.

The mechanic said the vacuum hoses are all okay. The fuel filter is new. The wires look okay and the check engine light does NOT come on. The engine looks fine but it revs as shown in the link. Also, if you put it in drive, the truck dies.

Does anyone have any other ideas? My mom is trying to sell the truck so I can go to a specific college program. We really need to try and figure something out. The truck wasn't driven after the potential buyer drove. It was only driven the same day we found the problem, to the mechanic.

Please help.


Tom Greenleaf
Ultimate Carjunky / Moderator
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May 15, 2013, 8:00 AM

Post #8 of 14 (1522 views)
Re: 1992 GMC Sierra 5.0(?) Revs, Idles and then will die Sign In

Can only guess at this. Perhaps a super low mile now old truck was driven hard for the first time in ages and blew some carbon or junk in items like idle air speed control which dictates idle speed and really floored it which it should have taken. Junk could have fouled up plain spark plugs - one or more?

The noise is probably some belt driven something. A tech right there would find that if only taking belt off to see if that goes away and spin pulleys without the belt.

I'm not there or here to blame any mechanic or shop but doesn't seem this got looked at very hard OR is perhaps too old a vehicle for some. Just saying can't read codes and looking at vacuum hoses saying they are good isn't enough for me.

Seems like neither you or your Mom are going to do the work and think another tech or shop is in order. I suggest simply explaining what it's doing to the tech not just a service manager who will look at it and allow his/her discretion on what it might need. Possibly just a good throttle body clean out and maybe new plugs. What none of us know is if the potential buyers did anything messing with things underhood not knowing what they were doing?

Unless this truck is rusted badly beyond reasonable repair it should be worth fixing and an easy sell. I've looked, new stuff is outrageously expensive and plenty of people want a truck for its utility not it's good looksWink

T



MarineGrunt
Enthusiast
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May 15, 2013, 12:12 PM

Post #9 of 14 (1511 views)
Re: 1992 GMC Sierra 5.0(?) Revs, Idles and then will die Sign In

Like Tom said, take it to another shop. Was it an actual shop or a mechanic friend looking at it? Did the mechanic just give up on it? Any competent mechanic isn't going to give up and would be able to figure it out.

When's the last time it had a tune up? I doubt this happened but who knows. Seems odd how it ran fine and then didn't the second someone took it for a test drive. Maybe the guy that took it for a test drive unplugged a spark plug wire or something trying to get a deal on it? Did he make a cheaper offer afterwards? Be sure to check both ends of the spark plug wires to make sure they're seated properly. Check electrical connectors, hoses, etc. too.


megan22013
Novice

May 15, 2013, 1:35 PM

Post #10 of 14 (1504 views)
Re: 1992 GMC Sierra 5.0(?) Revs, Idles and then will die Sign In

Myself nor my mom are capable of doing the work. If it was something I could fix, I would try that but I don't have any car skills besides installing a battery, and checking fluids.

It was a mechanic, who is also a family friend. We did take it to the shop he works at. It wasn't a service manager but an actual mechanic who we talked to. He just seemed very puzzled as to why it revs like that. My mom is nervous about having to pay to tow it to another shop and possibly being overcharged. She doesn't know of any reliable shops in our area. My father and grandfather have both passed and she doesn't know about cars and is afraid of being taken advantage of. I believe she was already taken on a ride with the potential buyer.

The offer was lower and she decided not to accept it.

Thank you for the replies. I will tell her what you all said and hopefully she can get a second opinion. I'll also tell the mechanic who has been looking at it too check the things mentioned.


HT
User

May 15, 2013, 3:25 PM

Post #11 of 14 (1500 views)
Re: 1992 GMC Sierra 5.0(?) Revs, Idles and then will die Sign In

You really need to find a reliable shop that you can stick with. Ask around for some "word of mouth" references. Don't look for the cheapest one, look for the one that does the best work and treats it's customers the best. Stay away from the chain store type things. They never work out well.


megan22013
Novice

May 16, 2013, 3:27 PM

Post #12 of 14 (1478 views)
Re: 1992 GMC Sierra 5.0(?) Revs, Idles and then will die Sign In

Thanks everyone for your input. We had another mechanic look at it and he told us the vacuum advanced module needs to be replaced. That's what's causing the truck to rev then die if you try to drive it.

Everyone was very helpful in figuring out what was going on.


HT
User

May 16, 2013, 3:41 PM

Post #13 of 14 (1475 views)
Re: 1992 GMC Sierra 5.0(?) Revs, Idles and then will die Sign In

I hope he knows what he's doing because there is no such component by that name. Maybe he meant Ignition Control module.


nickwarner
Veteran / Moderator
nickwarner profile image

May 16, 2013, 4:58 PM

Post #14 of 14 (1465 views)
Re: 1992 GMC Sierra 5.0(?) Revs, Idles and then will die Sign In

Some things get lost in translation from tech to customer to us. Hope it is good now.






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