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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: stevieray36 on September 25, 2007, 08:30:19 am
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1982 Chevy C10 w/350 autotrans was recently rebuilt, but used the old quadrajet. Engine idles fine and revs fine when setting. Take it for a drive and it just has no acceleration. We replaced the fuel pump, thought it might be a fuel supply issue. The gas pedal when depressed utilizes the full travel of the carb linkage. Any thoughts?
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well since you say the transmission was previously rebuilt, and its not due to fuel issues, then most likely something in the transmission isn't working correct. since i don't know much about rebuilding transmissions, i can't say exactly the problem. who rebuilt the transmission for you?
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Is the TV cable hooked up and adjusted properly?
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it must not be VilleZambonie since he can't seem to get the Acceleration channel ;D haha but yah that could also be the problem.
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Was my question a joke? We just rebuilt the engine not the transmisson. I took the truck to a transmission shop and they found no problem with the transmission. The thought was fuel supply so I replaced the fuel pump. I guess I should get the carb rebuilt thats all thats left.
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No you question wasn't a joke. I was confusing as to what got rebuilt with this statement:
1982 Chevy C10 w/350 autotrans was recently rebuilt.
I read that as you have a 82 C10 with 350 auto trans recently rebuilt.
It is clear now that the engine was rebuilt. Did you check the TV cable? Have you checked for vacuum leaks?
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I took the truck to a transmission shop and they checked everything out. They fixed leak at spedo cable and adjusted the modulator to make it shift quicker. Still no acceleration, when you floor it it does not drop down a gear like it did before the engine rebuild.
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Check:
qjet filter (in front of carb where fuel line joins it)
do as Chris stated, check for leaks in vacuum--does it idle smoothly?
Check ignition timing and components (dist.cap, rotor, etc)
When you say no acceleration....when driving, are the rpm's reving high under acceleration and the truck just isn't going anywhere, or are the rpm's lower than what it should be? Ir rpm's go up and truck doesn't go anywhere=transmission problems.
You said there was a leak found, was the fluid refilled to normal--must check level when engine is running and warm.
just throwing a few things out there
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Was my question a joke?
::)
DID YOU CHECK THE TV CABLE?
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All new vacuum lines, new fuel filter, removed to verify orientation. New distributor, cap, rotor, plug wires, and plugs. The timing is correct, engine starts easy and idles good and revs up and down while setting still. When driving the rpm's do not increase as expected and acceleration is slow. It is like the throttle peddle has a govener on it. Again I verified that when throttle pedal is floored it is moving carb linkage fully. The transmission shop "family friend" verified fluid level.
Vile don't want to appear stupid but what is the TV cable?
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You don't appear stupid if you don't know what it is, just ask. The TV cable is a cable that connects to your throttle linkage at the carburetor and goes down behind the engine and into the transmission. It stands for Throttle Valve Cable. Without TV cable pressure you will have high governor pressure and essentially be taking off in high gear and have no detent. So Check that the cable is hooked up and in and properly adjusted.
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Hey vile, you think this might be what is goin on with my R4? It has a detent cable is that the same thing as the TV cable. If so it's been jerry rigged with an electrical terminal and I thought this might be why my truck takes forever to shift when starting out. What do you think??
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Nativetexan, if your TV cable isn't adjusted right you can burn up the trans and it will cause the same issues. Did someone add some kind of connector to it or something?
Here is a link for adjusting it:
http://tciauto.com/Products/Instructions/instructions/gm_tv_cable_adjust.htm
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My uncle (the one who sold me the truck) said it broke and showed me where he rigged it. I cant realy remember it enough to discribe it, I'll check it out tonight and take pics and post. I will also try to adjust.
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. When driving the rpm's do not increase as expected and acceleration is slow. It is like the throttle peddle has a govener on it.
De ja vu. That's exactly how my truck is running, and I know its not the tranny.
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Here is the rig job. You can see the terminal is on the cable but loosely and it causes the throttle to rev before it even tugs on the tv.
(http://img220.imageshack.us/img220/2586/cimg2541cd4.jpg) (http://imageshack.us)
Here is a pic that shows how loose it is. I pushed down until it tensed up.
(http://img254.imageshack.us/img254/4825/cimg2543hh5.jpg) (http://imageshack.us)
I thought if I set the terminal further down the cable and crimped it, it would improve the shifting. But no such luck. after a test drive, it still had the same symptoms. accelerates like normal and then right when it should shift it just bogs. The acceleration goes away and it is just costing.
What to do?
I couldn't find anything that resembled an adjust tab. real life pics of the instructions would help. I guess a new tv cable would help too huh.
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spelling correction. costing should be coasting.
would a transmission flush and a filter change help any?? I heard mixed opinions.
Vile, any words of wisdom would be great.
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The length of that cable is important to the operation. The plastic piece hanging there is what normally would have connected to the throttle.
The pic you have corresponds to the instructions, but you need to push in the piece at the white arrow after pressing the release tab on the back of the bracket where it connects. Once you have it pushed all the way in (truck not running) open the throttle up to WOT and it should click for adjustment.
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Yes adjust it tighter as Chris suggests...Also instead of your eyelet they sell tv cable repair kit that comes with a new end that will fit on the carb.
https://www.vermontsecure.com/cart.asp?cID=79&AddItem=1&Sku=%238XXX.&ProductName=200-4R+Top+Throttle+Valve+Repair+End&PriceEach=2&Qty=1&Submit=Add+to+Cart
http://www.autozone.com/az/cds/en_us/0900823d/80/11/2a/59/0900823d80112a59/repairInfoPages.htm
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so the release tab is behind the mount. point it out in the pic if you can. meanwhile I will get the repair kit. Will the 79 work on a 87??
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yeah the ends will all work... look at the gold tab in this picture. Press it in hard and push the plunger towards the firewall....
(http://www.iotech.no/corvette/technical/700r4/images/cable%20adjust.jpg)
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Wow. what happened to stevieray's thread? It's been hijacked..
I know this is basic, but after checking the tv cable like Vilezambonie says did you check to see if the emergency brake is engaged?
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Yeah, I feel bad about crashing his forum. Hopefully he got what he needed.
Anyway, Finaly found the tab. But, the plunger is already in all the way, and i can't pull it out. Also, there aren't any clicks. Does this mean it is time for a new cable? I pulled the tranny end out to verify connection and what not and it seems good. I think it is seriously jacked under the hood though. Whatever caused the connector to break might have done more damage to the cable and plunger. ??? ???
StevieRay, If you need more help chime back in I think Im gonna replace the cable and check back in.
Thanks again guys for helpin this green-horn out.
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In your pic the plunger is NOT all the way in. Look at the pic with the arrow. You need to push that towards the firewall while depressing the tab.
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As Vile said, you don't want to pull it out, you want to push the release and push it IN. Then move the throttle to WOT.
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No problem, glad my email maybe got answers for others. I purchased a new TV Cable "Detent Cable" from local parts store for $15. I am going to install and adjust tonight. I will let you know if it fixed my problems.
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okay, I finally got it pushed in. But when I cranked to WOT. no clicks nada. It didn't do anything that looked like a self adjustment. it just stayed right where I pushed it. Is that it?
I can say that it did feel a little better but, only when little acceleration is given. If I floor the pedal it still doesn't do anything. the engine stops reving, the transmission doesn't shift. it just feels like somethings holding everything in a freeze. it just stops. But, the hayne's book has that sympton described the exact same way in the troobleshooting section. And the only thing they refer to is, you guessed it, the tv cable.
So, I got one on and will update also. when I replace it.
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Installed the new TV cable and adjusted as described. The truck now shifts as it should, when floored it down shifts as it should. Thanks to VileZambonie for his knowledge and interest in our troubles.
Know the catch, it’s my son-in-laws truck and he still feels the engine is not as strong as it should be. He feels it is under powered as compared to it before the engine rebuild.
Should I check the compression on each cylinder?
It runs fine, idles smoothly. It does run a little rough when you first start it, once it warms up it runs fine. I feel the Quadrajet needs a rebuild.
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What's your total timing at with the the vacuum advance hooked up and at say 2800 RPMS?
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another dumb question:
Huh?
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Check the timing at 2800 rpm's with everything hooked up. Total takes into consideration the centrifical advance and the vacuum advance which usually is unhooked and timing is taken at idle. Make sure your vacuum advance is hooked where it is supposed to be. I run my total around 30-32. No ping or hard start when hot.
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yeah, i think i am a little too green for that, so, I am gonna replace the cable and see what's what after that. Thanks any way though.