93 TY running issue - timing ?

[3rdgentug]

Truck will not go above @ 3000 rpms
Runs ok under that , will go thru all the gears, get up to speed as long as its kept under 3000 or so rpms.
Im thinking this is timing related - the owner I just bought it from had just had a new distributor put in and I believe it's not timed correctly.

Anything else I should check that might cause this?

 

[atkonkler]

Re: 93 TY running issue - timing ?

Mmmm check tru timing with brown wire unplugged, trans cable/ shift linkage issue... I'd have to see it to better diagnose ... If I think of anything else I'll update ya!

 

[3rdgentug]

Re: 93 TY running issue - timing ?

Im fixing to check the timing ,I am just waiting on my borrowed timing light to be returned.

I will check the trans cables as well just to be sure.

If I cant get it sorted out soon I will upload a video

 

[3rdgentug]

Re: 93 TY running issue - timing ?

Ok so I got my timing light back finally , got a 2nd battery all charged up , disconnected the brown w/ black stripe wire under the carpet on pass. side.

But I cannot read the timing tabs - I tried to clean it with a scotch brite pad but its got rust on it. The numbers are unreadable.
Anyone have a picture I can look at ? Im searching these forums and using google with no luck so far.

 

[3rdgentug]

Re: 93 TY running issue - timing ?

Got the timing numbers figured out - I rubbed some water on the scotch brite pad and it was easier to see.
So that was good news.

My timing is dead on balls accurate at 0*'s. Which now really has me stumped, I was positive that was going to be the issue.

 

[Slyclone]

Re: 93 TY running issue - timing ?

80 grit sand paper. If it dont cut into the rust you better step it down to like 24 grit. Scotch brite probably wont work.

I am pretty sure it says 0-4-8-10 PAST? I just looked at my POS indicator and its going to be replaced quite soon.

OK so you got it timed- Look beyond that now thngs such as cap/rotor condition. Vac lines for any sort of leaks or dry rot. Really its tough calling the shots but you got to start with the basics first. With out knowing any vehicle history/condition its like the blind leading the blind.

 

[3rdgentug]

Re: 93 TY running issue - timing ?

80 grit sand paper. If it dont cut into the rust you better step it down to like 24 grit. Scotch brite probably wont work.

I am pretty sure it says 0-4-8-10 PAST? I just looked at my POS indicator and its going to be replaced quite soon.

OK so you got it timed- Look beyond that now thngs such as cap/rotor condition. Vac lines for any sort of leaks or dry rot. Really its tough calling the shots but you got to start with the basics first. With out knowing any vehicle history/condition its like the blind leading the blind.

I know what ya mean. This is one of them things about buying a used vehicle , have to find out what someone else did or didn't do to it.

It has a brand new dizzy in it. plugs are good , all wires look fine.
I have personally checked all the vacuum lines I could find. All of them feel ok and no noticeable cracks/breaks or collapsed lines.
I have my phone on the charger now so I can make a test drive video , hopefully that will help.

 

[3rdgentug]

Re: 93 TY running issue - timing ?

80 grit sand paper. If it dont cut into the rust you better step it down to like 24 grit. Scotch brite probably wont work.

I am pretty sure it says 0-4-8-10 PAST? I just looked at my POS indicator and its going to be replaced quite soon.

OK so you got it timed- Look beyond that now thngs such as cap/rotor condition. Vac lines for any sort of leaks or dry rot. Really its tough calling the shots but you got to start with the basics first. With out knowing any vehicle history/condition its like the blind leading the blind.

Also, thanks for looking for me , I appreciate that. :tup:

 

[3rdgentug]

Re: 93 TY running issue - timing ?

http://www.youtube.com/watch?v=ZS5-GTOXD3s&feature=youtu.be

The first minute I was leaving my neighborhood , you can see it runs good and pulls pretty hard right til it hits the 3000 rpm area.
@ 50 seconds in you can see the first time it does it , then I show what it does a few more times. You can clearly hear something is rotten in Denmark in the video.

Hope the video sheds some more light on my issue.

 

[Slyclone]

Re: 93 TY running issue - timing ?

I am thinking have you jumped out the ports to obtain any info? Blinks multiple times.

My first thought was has it gone into a safe mode. Limitations and restrictions.

Second thought was have you checked the trans fluid, smelled it and looked at the level/color.

 

[3rdgentug]

Re: 93 TY running issue - timing ?

I am thinking have you jumped out the ports to obtain any info? Blinks multiple times.

My first thought was has it gone into a safe mode. Limitations and restrictions.

Second thought was have you checked the trans fluid, smelled it and looked at the level/color.

I haven't jumped the ports , but I am not getting a check engine light , I will go try that here in a second to see if there are any stored.

Trans fluid is full, color is ok, and doesn't smell burned. Trans shifts out fine , has all the gears and tcc lockup is working too.

 

[Big Mike]

Re: 93 TY running issue - timing ?

What chip does your truck have? An ultimate chip in valet mode did the same limited rpm and boost.

 

[3rdgentug]

Re: 93 TY running issue - timing ?

What chip does your truck have? An ultimate chip in valet mode did the same limited rpm and boost.

I know it has a aftermarket chip , but I have no idea which one.
The previous owner is sending me a folder with all of the receits for all the parts, but I do not have it yet.

 

[3rdgentug]

Re: 93 TY running issue - timing ?

I am thinking have you jumped out the ports to obtain any info? Blinks multiple times.

My first thought was has it gone into a safe mode. Limitations and restrictions.

Second thought was have you checked the trans fluid, smelled it and looked at the level/color.

Error code 4 2 was stored

 

[Don W.]

Re: 93 TY running issue - timing ?

My 2 cents is a plugged cat or ignition. The boost gauge goes into boost just a bit which, I think, means you have a stock chip. Only because all the after market chips THAT I"ve HEARD OF won't go there. (Needle stays in the green.) I hear a slight miss at 3k. Probably worse if I was there. It happens as boost comes in, loading the cylinders (high cyl pressure make the ign have to work harder.) indicating an ignition breakdown somewhere.

If not the cat then it's ignition. Check the plugs, age and condition. I've had similar issues and it was the wires. Nothin' obvious or definitive but everything went away with new wires.

Actually I'd start here. The cat would be second.

HTH

 

[3rdgentug]

Re: 93 TY running issue - timing ?

My 2 cents is a plugged cat or ignition. The boost gauge goes into boost just a bit which, I think, means you have a stock chip. Only because all the after market chips THAT I"ve HEARD OF won't go there. (Needle stays in the green.) I hear a slight miss at 3k. Probably worse if I was there. It happens as boost comes in, loading the cylinders (high cyl pressure make the ign have to work harder.) indicating an ignition breakdown somewhere.

If not the cat then it's ignition. Check the plugs, age and condition. I've had similar issues and it was the wires. Nothin' obvious or definitive but everything went away with new wires.

Actually I'd start here. The cat would be second.

HTH

I will check to see about the cat. con. If that is it I can just replace it with pipe no big deal.

Im pretty sure its not going to be a stock chip , but I will pull the ecm out tomorrow and take a look. Truck has upgraded turbo and injection.

The PO had put plugs and performance wires on there obviously not too long ago , I pulled 1 plug just to see what it looked like and it wasn't bad looking at all. The coil is msd
and it had a billet distributor in it , but has been replaced with what looks to be a stock replacement distributor. I checked all the wires to see if one was bad or off ect.. and did not see any signs of anything wrong. I did notice the msd 6al box that is on the truck is not hooked up. Im starting to wonder if they had some other problems at one time and now they got put onto me.

Its not slight miss in person , it literally feels like its being choked - in the video as soon as I hit 3000ish rpms and it started acting up I put my foot into it all the way to the floor. It will not go any higher. Something is definitely holding it back. Im really curious actually about one of the previous posters talking about a valet mode - I googled that and it sure seems like that may be the culprit. The truc at one time had an alarm on it too that looks to have been deleted. There is also a phantom switch on the lower dash no one seems to know what the hell its for too.

 

[Don W.]

Re: 93 TY running issue - timing ?

I can't vouch for the valet mode one way or the other. BUT, if it has a MSD coil change that first. Simple check except for buying the replacement... Also check the connector between the dist and the coil.

Or... What I did once a long time ago was take the truck to a shop that had a scope and paid them to check it. IE Don't fix it just tell me what's wrong. Beats throwing parts at it.

 

[3rdgentug]

Re: 93 TY running issue - timing ?

Ain't that the truth , I'm not in a position right now to throw parts at a truck . And I will try everything possible before I take one of my vehicles anywhere to pay someone else to work on them ( unless its something like diagnosing electrical stuff , Im horrible about that).

 

[3rdgentug]

Re: 93 TY running issue - timing ?

What chip does your truck have? An ultimate chip in valet mode did the same limited rpm and boost.

How would I disable this , I am leaning towards this is what is going on now.

 

[GEMELLI]

Re: 93 TY running issue - timing ?

How would I disable this , I am leaning towards this is what is going on now.

There should be a switch somewhere. In the glove box, in the console, on a kick panel, on the dash, under the dash, etc. It can be anywhere, but most likely somewhat hidden and accessible from the driver's seat.