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What is causing my speedometer to spike from Zero to 50 ...
Sent to Honda Experts February 21 08:00 PM

What is causing my speedometer to spike from Zero to 50 when I am at idle and the car is not in gear, Then when I let off the clutch and shift thru gears it bounces from 50 to 120 back and forth. My car is a 1994 Honda Civic Hatch with a V-tech Mini-Me swap.

 

Optional Information:
1994 Honda Civic 1.5L

Customer (name blocked for privacy)
Status:  Closed   Value: $9
Answer
February 21 8:05 PM (5 minutes and 14 seconds later)
         
ACCEPTEDCheck Mark

Sounds like you have a bad speedometer gauge.

If the check engine light was on than that would indicate there is a problem between the VSS and the computer and the computer is relaying that signal to the speedo. Typically from what i have seen when the speedo goes bad there is almost like a voltage spike that makes the needle jump.

If you like i can try to upload teh proceedure to test the system directly at the speedometer. That way you can make sure 100% that its nothing in the rest of the system.



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lorunner -- Auto Service Technician -- 99% Positive Feedback on 490 Honda Accepts
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Reply
February 21 8:14 PM (8 minutes and 56 seconds later)
         
If you could upload that test procedure that would be cool. Also with this problem, would this cause my V-tech to open sometimes and other times it wont, or is that another problem.
Customer (name blocked for privacy)
Info Request
February 21 8:20 PM (6 minutes and 18 seconds later)
         

Sure not a problem. Just give me a few minutes to get it going.

As for the Vtec do you know what model the car is? DX, LX, EX



If your happy with my services please ACCEPT. dont forget about feedback. I want to know what you think

If it says offline Im probably doing something else but i do check back periodically.

Dont forget those BONUS'S.
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lorunner -- Auto Service Technician -- 99% Positive Feedback on 490 Honda Accepts
11yrs honda tech, 15 yrs in the business, ASE certified, honda school and training
Reply
February 21 8:27 PM (6 minutes and 50 seconds later)
         
It is a cx with a mini-me swap. I put a vx V-tech head on my CX block. Sometimes the V-tech opens sometimes it does not.
Customer (name blocked for privacy)
Answer
February 21 8:30 PM (2 minutes and 52 seconds later)
         
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lorunner -- Auto Service Technician -- 99% Positive Feedback on 490 Honda Accepts
11yrs honda tech, 15 yrs in the business, ASE certified, honda school and training
Reply
February 21 8:48 PM (18 minutes and 45 seconds later)
         
Same wiring harness, I put in a p28 AO1 ecu for a 5 speed. I tied the V-tech into a sensor on the back of the intake to open at a certain range.
Customer (name blocked for privacy)
Answer
February 21 8:52 PM (3 minutes and 24 seconds later)
         
ACCEPTEDCheck Mark
Hmmm. Im not that familiar with the swaps that people do. If that PCM doesn comand or have the comand to operate the Vtech on its own and you tapped into another sensor I would either suspect that maybe the PCM is failing or the connections that you used might be corroded or not making good contact. If you didnt use weather tight connectors that may be the case. I would check them first for any signs of corrosion.

If your happy with my services please ACCEPT. dont forget about feedback. I want to know what you think

If it says offline Im probably doing something else but i do check back periodically.

Dont forget those BONUS'S.
Picture
lorunner -- Auto Service Technician -- 99% Positive Feedback on 490 Honda Accepts
11yrs honda tech, 15 yrs in the business, ASE certified, honda school and training
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