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Second Generation Legend (1991-1995)

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Old 11-12-12, 01:55 AM   #1 (permalink)
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Help! Wierd stuff going on!

My 94 Legend started revving fiercely in pulses on it's own and forced the engine to overheat. Now the ABS and brake light are coming on periodically too.

Any ideas on what the cause and cure could be?

Thanks for your help!

Carlton
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Old 11-12-12, 07:42 AM   #2 (permalink)
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Check you coolant level and bleed system also check you brake fluid level if it's low check for leaks in you brake lines and check brakes. Check your abs pump for leaks.
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Old 11-28-12, 11:58 AM   #3 (permalink)
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My understanding is that when your coolant is low in the radiator, an air bubble forms in the upper radiator hose - right were the water temperature sensor/gauge is. This air - much hotter than the water - causes the sensor/gauge to spike up, which causes the ECU to rev down the engine. Somehow this causes the air bubble to move away from the sensor and then the engine revs back up. But not soon after the air bubble returns and the engine revs down again. Again and again and again.

So just add coolant. Hopefully your car is not actually overheating. Does the water temp gauge needle spike up and down too?

My car was actually doing this, this morning. I haven't added coolant in a while and hopefully that's all I need to do. I seem to have to add collant every 6 months or so, yet I don't see a leak and I'm pretty sure I don't have a BHG.

Another problem is that many of these cars have a seeping head gasket, that is a blown head gasket that allows air to be forced into the cooling system. If this is the case then you have much bigger problems. If you have oil in your coolant and/or you're burning coolant (white smoke?) than you're up the creek.

I'm no expert in this, so if I'm wrong, please correct me.
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Old 11-28-12, 12:05 PM   #4 (permalink)
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Like I said, my legend was doing this same thing this morning.

So i'm going to add some coolant to mine right now and I'll let ya know if it fixed the problem or not.

EDIT:

Yup! I was real low on coolant in the radiator and after filling it up, no more pulsing revs.

Hope this helps ya
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Old 11-28-12, 02:32 PM   #5 (permalink)
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Just refilling the coolant is not enough, the system also needs to be bled correctly. If your having to add coolant that means you have a leak some where. The part stores rent pressure testers, use one to find the leak.
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Old 11-28-12, 06:14 PM   #6 (permalink)
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Same thing happened to me. All I did was replace the wore out brake pads on the rear wheels and then no problems.
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