Tachometer bouncing?
#1
Tachometer bouncing?
Hey guys well I am new to this forum, long time rover fan. Owned a 97 Disco (with 250,000 miles at time of totalization) and a 96 Range Rover. Now I have purchased a 98 Disco for fun that I only payed a couple grand for. Anyway,I am going to replace all the spark plugs and wires because the plugs are all loose except for one. Also I noticed the Tach bounces all over I mean by like 1000 RPM's and though the engine runs a little rough it is not that bad. Could the loose plugs cause the rough idle?Anybody had this experience before with loose plugs? Any other ideas on what I should check? I am going to flush the engine and run some high grade oil through. Any help or ideas would be most appreciated, trying to make this one last over 200,000 miles too.
#3
RE: Tachometer bouncing?
I had simaler symptomswith my 98 Disco. After messing with all the ignition components it still continued to sputter at times with the Tach jumping all over the place. A very good mechanic finally figured out it was a bad driveshaft speed sensor. This might be worth a look. My Discovery has 208,000 miles on it and it is still going strong.
Hope this helps.
Gtlux
Hope this helps.
Gtlux
#4
RE: Tachometer bouncing?
Mike,
In reference to your question, they are loose like they jiggle a little bit when i touch them. They can be fairly easily tightened but I have not done this since I am going to replace the plugs and hoses on Thursday. Is that what you meant was a jiggle or did you think I meant they would fall out? Cause they are still stuck in they just wiggle.
In reference to your question, they are loose like they jiggle a little bit when i touch them. They can be fairly easily tightened but I have not done this since I am going to replace the plugs and hoses on Thursday. Is that what you meant was a jiggle or did you think I meant they would fall out? Cause they are still stuck in they just wiggle.
#5
RE: Tachometer bouncing?
I believe what Mike is asking - Are the spark plugs ( which screw snugly into the aluminum heads) themselves loose & wiggly? Or are the connectors (boots) loose?
If it's the spark plugs, then I wouldn't even start the engine again, unless checked by a TRUSTED mechanic. You have options, but limited w/out pulling the heads.
The only reference I'm aware of to the tach bouncing is when the alternator is malfunctioning (or wearing out) as I understand it drives your tach.
If it's the spark plugs, then I wouldn't even start the engine again, unless checked by a TRUSTED mechanic. You have options, but limited w/out pulling the heads.
The only reference I'm aware of to the tach bouncing is when the alternator is malfunctioning (or wearing out) as I understand it drives your tach.
#6
#7
RE: Tachometer bouncing?
I would assume that when you say "I" you are doing the work.
Take it for what it's worth, but I would'nt even start the engine w/out resolving EVERY loose spark plug issue.
The heads that the spark plugs screw into is aluminum and will NOT tolerate the insane combustion pressures for very long w/ loose spark plugs.
You might ask someone else (mike) to weigh in on this, unless you have a crapload of time/money.
There are remedies if no damage was done yet,(some simple) but I can't type so I'm going to step back, Good luck, Greg
Take it for what it's worth, but I would'nt even start the engine w/out resolving EVERY loose spark plug issue.
The heads that the spark plugs screw into is aluminum and will NOT tolerate the insane combustion pressures for very long w/ loose spark plugs.
You might ask someone else (mike) to weigh in on this, unless you have a crapload of time/money.
There are remedies if no damage was done yet,(some simple) but I can't type so I'm going to step back, Good luck, Greg
#9
RE: Tachometer bouncing?
Okay guys, so tommorrow when I replace the plugs and wires, what else would you reccomend I do while I have it all a apart? I am hoping that the new plugs will just tighten into place. It seems like someone just didn't tighten the old plugs enough because I was able to tighten the existing ones fairly easily and there was no wiggle or movement at all. So since I am replacing them anyway what else should I look for while I am down there? I really appreciate all the help I have already receved here so thanks for that too.
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