The car is running great and I have it registered and insured so now its time to drive it, It has been sitting for quite awhile and has some bugs to work out.
First is the speedometer. It reads fast, like 25-30+MPH fast. (75MPH = 120+++) The HUD is accurate. Can this be just a cable or is the speedo done? I would hate to have to replace that.
Second is the "Check gages" light. Its on all the time so is the low fuel light. Probably associated right? How do I get rid of the low fuel light? yea the tank is full.
Third the HUD light goes out from time to time. I really need this since the speedo is AFU. Loose wire?
Forth, Power antenna was butchered up. An aftermarket one was installed and the wires were raped. What is the wire color code for radio/accessory and ground from the original plug. The schematic doesnt have the wire colors matching with what is there.
Im sure there will be more like the rubber burninf smell(no not the tires), odd leak from the tranny, it left a puddle but no visible leak underneath. Coolant loss, again no leak found.
Quote from: 95GTPFirst is the speedometer. It reads fast, like 25-30+MPH fast. (75MPH = 120+++) The HUD is accurate. Can this be just a cable or is the speedo done? I would hate to have to replace that.
Second is the "Check gages" light. Its on all the time so is the low fuel light. Probably associated right? How do I get rid of the low fuel light? yea the tank is full.
The speedo has no cable. It's electronic. :wink:
As far as the check gauges/fuel light....go here: http://www.w-body.com/service/checkgauges.html
my speedo had that problem and I replaced the cluster, problem solved. While it's out make the "intercooled turbo" light up.
Mine had the same problem, too. Replaced the cluster, problem NOT solved. It's off by exactly the same amount as the last cluster (10-15 mph) :shock:
Quote from: 6000STE/AWDMine had the same problem, too. Replaced the cluster, problem NOT solved. It's off by exactly the same amount as the last cluster (10-15 mph) :shock:
I think all TGP's are like that..from most of the owners I've talked to, it certainly seems that way...the black TGP is off by a varying 10-15 mph and the HUD is right.
And there's no cure for this? Maybe some other electronics somewhere else? A short in the wire some where?
When I replaced my cluster, it was right up until 50 mph or so. After that it would be about 5 mph faster than you're actually going. I guess it could be worse, it could read slower, and you'd always be speeding. Good thing the HUD and DIC are always right. I think I remember Shawn from the wbody board said to fix it that you had to solder either a 1M or 1k resistor across two pins on the speedo. I will try to find the pic he sent me on the fix.
Check and clean your electrical grounds for the cluster and out to the fire-wall. If you do not have a proper ground to the cluster it will not give accurate readings at the cluster. If I recall correctly the HUD uses an isolated ground source and is not effected showing correct speeds... 8)
I think the speedo problem was common to all grand prix of that year. My N/A has the same problem as do all of my friends who have GP's from early 90's. I think they did it on purpose. It seems right on all of them up till about 50-55 then it kind of exponentially gets worse. 80 on the speedo is about 65 or so and worse from there. It would be nice if there is a way to fix it just by soldering in a resistor or something.
Quote from: tyroeliteI think the speedo problem was common to all grand prix of that year. My N/A has the same problem as do all of my friends who have GP's from early 90's. I think they did it on purpose. It seems right on all of them up till about 50-55 then it kind of exponentially gets worse. 80 on the speedo is about 65 or so and worse from there. It would be nice if there is a way to fix it just by soldering in a resistor or something.
My first 90 LE wasn't off at all IIRC. My second 90 LE was off when I got it, but more than one thing was messed up with the cluster. So I swapped in my gauges from my first LE and it's still off. So that leads me to believe that TGPilot is right..and that it is a ground issue somewhere.
My TGP is affected by the same problem. :cry: After the Holiday season I will start looking for the root cause of the problem.
BOth my HUD and Speedo are off by an increasing amount as I accl.
The speedo and hud read slower then actual speed, like at 25 It reads 20 not bad 55 reads 33, at 70 it read 50. Any Ideas. Some back ground. The speedo and hud worked fine until I had the tranny rebulit 5yrs ago and the speedo and hud have been acting this way ever sunce. Any ideas??????
KCP
Quote from: 90tgpblkBOth my HUD and Speedo are off by an increasing amount as I accl.
The speedo and hud read slower then actual speed, like at 25 It reads 20 not bad 55 reads 33, at 70 it read 50. Any Ideas. Some back ground. The speedo and hud worked fine until I had the tranny rebulit 5yrs ago and the speedo and hud have been acting this way ever sunce. Any ideas??????
KCP
Ssounds like if it was immediately after the tranny service that they might have damaged the speed sensor in the tranny. They may have also not gotten a proper ground for the sensors on that side of the engine bay... 8)
I have had it looked at they said it was internal on the tranny. I am planning on replacing the tranny soon any way hopefully that will fix it.
I am thinking that maybe they did not put the proper gears in like the standard gp gears not the turbo parts. If there is a difference in the gears from the regular gp and the tgp. I can't remember if there is or not.
Thanks for the info tgpilot
KCP
Thanks everyone for the info. All excellect places to start especially the check gauges light , I checked out all the sites but i guess I missed that one.
Speedo, I will check into that in depth myself when the time allows and I will let you know when of if I find something. I will look into the grounding problem of a poor connection before I replace the cluster.
They used the wrong year governor. Its unlikely the speeds sensor is damaged and works at all. The sensor is just a pickup. The governor has a wheel on the end of it that has 'teeth' in it that pass near the sensor. There are at least two different style governors. One has about 1/2 the teeth of the other. I've never actually counted. Why didn't they fix it 5 years ago?
Chris, do you know of any possible solutions for the speedo dillema? I don't know if it's just the gauges since 2 of them are doing the same exact thing. Anything besides grounding to check for?
No. The analog guage is calibrated from a resistor grid etched onto the back of the cluster. The HUD and DIC read directly from the VSS signal. So does the guage, but there is no analog conversion for the DIC and HUD.
Since you have replaced your cluster, its entirely possible that the grid was degraded on both. There is really no other possibility if the HUD reads correctly.
IF they are both off, then the problem is with the VSS signal.
THe thing with the 4t60 is the VSS is driven from the differential, so regarless of gears, chain cogs etc it will always read the axle speed. The only thing that would change that is tire size.
Chris it's a long story, but it was rebulit when I was away at college 3 hour drive form where I lived at the time. They wanted me to bring it back there to have it looked at. A week at least at the time they told me. Anyways it wasn't a huge deal at the time. I am just sick of it now. so you think they put the wrong year govner in the tranny. How hard is it to replace. Is somthing that the tranny needs to come out or is something that can be done with it in the car. Thanks for the help Chris.
KCP
Its very easy to change. Its in the tailshaft of the trans. You rotate the engine forward and look down at the trans from where the alternator is, use a long extension/extensions to remove the two 13mm bolts from the top, remove the cover, remove the governor and reinstall. Very easy.
Thanks Chris for the info. Any parts store should have or be able to get that part correct? Thanks again..
KCP
Quote from: Chris AThey used the wrong year governor. Its unlikely the speeds sensor is damaged and works at all. The sensor is just a pickup. The governor has a wheel on the end of it that has 'teeth' in it that pass near the sensor. There are at least two different style governors. One has about 1/2 the teeth of the other. I've never actually counted. Why didn't they fix it 5 years ago?
Magnetic sensor??? If it is then it might be possible that metal particles/shavings are on the magnetic part limiting the true signal and giving a false reading. I have seen this on ABS sensors at the wheels and cleaning them fixed numerous problems.
Cluster bridging. Read out all the components for the correct resistance (resistors). An open bridge will definately cause some problems.
All these theories are feasable. Now I want to take apart the dash and find out but I'm having too much fun driving it, I can live with the minor defects for now.
While that is entirely possible, its is rather unlikely for any metal shavings sizeable enough to get up there to cause any problems. IMO if you do, then the speedo is going to be the least of your problems.