What does the RPM gadge measue?

25

Asked by Apr 20, 2007 at 09:33 AM about the 1993 Ford Mustang LX Hatchback

Question type: Maintenance & Repair

My car is slowing down significantly.  I noticed this problem when my exshast manifold had a crack in it.  I was told that I go a while before replacing it because I didn't have the money.  Big MISTAKE!!!  The crack got so big that I had to replace the whole thing.  But every since then, my RPM gadge hasn't been working properly and now it doesn't even move.  Have I created a bigger problem for myself?

7 Answers

3,225

The exhaust manifold has nothing to do with the RPM gauge. The RPM gauge merely measures how many "rotations per minute" your engine makes. Most cars dont even have them. It will cause no harn to your car if the gauge doesnt work.

155

the more you let the crack go the more significant damage your doing to your engine. with a leak in the manifold your engine is losing back pressure. and without sufficient back pressure u can plan on having a lot more problems

85

The large crack in the exhaust manifold could have caused some further damage to your engine, but I doubt that it would overtly effect the RPM gauge after it is fixed. I think that there are just two problems that your going to have to look into.

2,300

That would have been a super opportunity to upgrade to a set of headers rather than the factory manifold.

7,695

if you want to fix the problem get under the hood and check out the distributor. the tach wire on my camaro attatched to the back of my distributor cap. its possible it came undo in your car also. although it may be different in mustangs

7,695

no rpm guage tells the number of rotations your crank makes per minute not tire rotation.

7,695

furthermore, if your tach wire is attached properly then you probably have a short somewhere. use an ohm meter to find out if the wire is grounded out or not. if the wire isnt grounded out and it is attached properly to the distributor then you might possibly have a broken guage. like others have said it wont hurt your car if it doesnt work properly

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