Thread: Engine Rpm Swing

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OK GUY'S I NEED HELP WITH MY 93 HONDA ACCORD EX. YES STREETE ANOTHER RICER, WITH THE CAR RUNNING AT IDLE , IN PARK OR NEUTRAL AND THE TURN SIGNALS ON THE ENGINE RPM IS SWINGING 20-30 RPM . OBVIOUSLY IT'S DUE TO THE LOAD ON THE ELECTRICAL SYS. NOW HOW DO I CORRECT IT ?, BAD OR MALFUNCTIONING VOLTAGE REGULATOR ? ANY EXPERTISE WOULD BE GREATLY APPRECIATED.

Why are you worried about 30 RPM? If it really bugs you maybe you could put a capacitor in the turn signal system that MIGHT even out the current.

Abe

I have to agree with Streets on this one. Quit playing with the directionals when parked and the problem goes away.
AL

OOPS ! It does it all the time , when setting at a traffic light, or wherever , maybe it's 80 or 90 rpm, come on guys humor me, of course you've already done that huh ? seriously, it never did it from the time it was new until now. And I do use them that's what their there for. Shirley one of you motor heads knows the answer, Streets will want me to buy another car. Thanks

Geez Tim, Honda drivers around here NEVER use their signals, I just assumed it was an economy move on Honda's part. If that's as typical around the country as here that might explain why no one has the answer.

Okay, okay, ten year old car here. Could it be this is a sign of wear? I don't have a wiring diagram on one of these, but if it takes it's signal from the distributor as the aftermarket ones do you may be seeing evidence of some slop in the distributor drive system e.g. gears, belts, whatever. Or does it read from a sensor on the crankshaft snout and there's something at the sensor that's interfering with the signal?

My mom's Maxima has got no torque like your Honda, but the computer in the Maxima will rev the engine to compensate when you put load on at idle by doing somehting like turning the steering wheel really quickly while stopped. But hey, as long as your car isn't stalling, you're fine.

The above post makes me wonder. Does your car have an idle air control motor?

Abe

Geez! You guys are getting too nice, I just new someone was going to tell him to buy an american car. Okay, here's what you should do....Drive down the open road at anywhere from 30 to 55 M.P.H. Turn on your flashers and go right past any Honda dealers. Pull straight into a Chevy or GMC dealer and trade that sucker in. Try not to laugh to hard when you leave.

Vegas


Sorry the devil made me do it. I'm sure some one will be able to help you out.

Is it only with the blinker?

Try a few things.

Try flashing the headlights on and off, and see if it does the same.

Try mashing the brake pedal and looking for the RPM change.

If these other amp loads do it, you could be looking at a ground issue.

Just for good measure I would remove and clean the battery terminals, and where the ground strap goes to the block. Then give it a try.

If it is only doing it on blinkers, then back track your grounds to the blinker.

If all else fails, you may just need a tach filter replaced or installed.

OK, a few things. Check your coils for excessive resistance on one side. The ground is a good idea. I personally like to run one directly off the negitive post to a bolt for the body. Sounds strange, work well. Could be a CMP or CKP starting to loose sensitivty. Also, try taking it out, finding a good long stretch of road, and maxing it out. If you can get above 70 in less then 10 minutes, try and trade it into a GM dealer as a "high performance model" Seriously though, try running a bottle of fuel injector cleaner through it. If the system senses a lean fire, it will try to double fire the injector, causing a surge in RPMs. Sounds stupid, but try it. A injector the size of a pin clogs very easily

I'm sorry Tim. I thought you were kidding. You realy own a Honda? Pulsing at idle is caused by the computer. It's getting improper input from one of the sensors. The blinkers are draining power from one of the sensors. I would suspect a bad ground on one of your lights.
When my Aerostar was pulsing at idle it was a plugged air filter.
The maf sensor was trying to tell me about it.
AL

Is the motor really surging, or is it just the tach reading? Can you feel it? Could be the signals are somehow himpacting the electrical load and altering the tach reading.

Pat

Wow now that's what I call biased opinions. Drg84 and vara , cute really cute , ( it did generate a good laugh) that's what I like about this group here on CHR. Darm sure ain't for the thin skinned. Thanks for the responses Guy's, It's really a good car, garage kept, only a couple of door dings, all Metallic Black , and for the most part it's trouble free and very well maintained with 130 K miles, I also have a Suburban ( GM) 29 Model a Tudor, 40 Ford Deluxe Coupe, and Building a 32 3 Window, so 1 out of five ain't too bad, AW come on "Streets" you outa be able to make somethin outa that .
Yes the RPM is really swinging, not just the Tach, not sure on the other ACC. will have to load it up and see what's up, now this is with the A/C on and or Heater blower motor running , no swing with those, it is most noticable with the turn signals, not sure on the Emerg. Flashers, will have to check out the possibility of a poor ground in the lights though, (excellent idea )seems like if the Hazards do it it should be more pronounced due to the heavier current draw. Really Guy's I do appreciate your input, will keep ya'll posted what I find , that is for those whom really care, Thanks again.