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#1
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Idle RPM sensitivity to signalling?
I have a 95 Grand Prix GTP, and if I'm signalling at idle (in gear, my
foot on the brakeat a dead stop) my RPM decreases by about 50 RPM when the signal light is lit and cycles back up when it turns off and continues during the periodicity of the signalling. My dash lights also slightly dim with the same trend. My question is, is this normal? Should the engine idle and interior accessory lights really be this sensitive to such a small electrical draw? I have checked my battery at idle and it's charging at 13.8V, and I haven't had any other electrical problems. However, I do have some other erratic idling when not signalling, so if this could all be attributed to the same electrical problem I'd love to figure it out. Thanks. 407 |
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#2
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Idle RPM sensitivity to signalling?
Aaron407 wrote: > I have a 95 Grand Prix GTP, and if I'm signalling at idle (in gear, my > foot on the brakeat a dead stop) my RPM decreases by about 50 RPM when > the signal light is lit and cycles back up when it turns off and > continues during the periodicity of the signalling. My dash lights also > slightly dim with the same trend. My question is, is this normal? > Should the engine idle and interior accessory lights really be this > sensitive to such a small electrical draw? I have checked my battery at > idle and it's charging at 13.8V, and I haven't had any other electrical > problems. However, I do have some other erratic idling when not > signalling, so if this could all be attributed to the same electrical > problem I'd love to figure it out. Thanks. > > 407 Do you mean that the directional signals cause the idle to drop, or that the brake lights cause the idle to drop? if the latter I would actually suspect a vacuum leak in the brake booster. nate |
#3
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Idle RPM sensitivity to signalling?
The car is an automatic, and if I'm sitting stopped with my foot on the
break, in gear, signalling at a stop light for example, the RPM fluctuates with the periodicity of the signal light. If I merely shut my signalling off the erratic idling stops. Does that clarify anything or did I basically just repeat what I just said? Hopefully it helps... 407 |
#4
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Idle RPM sensitivity to signalling?
So you have all the electrical accessories on. Do you have an after
market radio with hi wattage amp? I think you are just seeing the load that a fully loaded alternator can put on an engine. Stan Aaron407 wrote: > > I have a 95 Grand Prix GTP, and if I'm signalling at idle (in gear, my > foot on the brakeat a dead stop) my RPM decreases by about 50 RPM when > the signal light is lit and cycles back up when it turns off and > continues during the periodicity of the signalling. My dash lights also > slightly dim with the same trend. My question is, is this normal? > Should the engine idle and interior accessory lights really be this > sensitive to such a small electrical draw? I have checked my battery at > idle and it's charging at 13.8V, and I haven't had any other electrical > problems. However, I do have some other erratic idling when not > signalling, so if this could all be attributed to the same electrical > problem I'd love to figure it out. Thanks. > > 407 |
#5
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Idle RPM sensitivity to signalling?
I do indeed have an aftermaket stereo with fairly decent capability of
power drain (~600Wrms), but this problem arises whether the stereo is on or not. Last night for example, I had this problem and the stereo hadn't been on for at least 20 minutes of driving, so I would think that the battery should have been recharged fully by this point. But please keep firing away with possible causes, I really appreciate any help. 407 |
#6
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Idle RPM sensitivity to signalling?
Does this same problem happen during the day when the headlights are not
on? I would guess not. At night when this happens at a stop, put the trans. into neutral and see if problem goes away. Stan Aaron407 wrote: > > I do indeed have an aftermaket stereo with fairly decent capability of > power drain (~600Wrms), but this problem arises whether the stereo is > on or not. Last night for example, I had this problem and the stereo > hadn't been on for at least 20 minutes of driving, so I would think > that the battery should have been recharged fully by this point. But > please keep firing away with possible causes, I really appreciate any > help. > > 407 |
#7
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Idle RPM sensitivity to signalling?
I just assumed that since the car has daytime running lights that it
wouldn't be much different at night unless I used the highbeams. Anyway, I have noticed that when I put it into neutral the problem does go away as the engine is under less load. Out of curiousity, at night without the highbeams and A/C off, approximately how much power should all the accessories (including the daytime running lights and aftermarket stereo) consume? I guess small electrical problems like this could possibly be attributed to this draw and the cheap Canadian Tire battery I have. |
#8
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Idle RPM sensitivity to signalling?
Sorry, I meant -excluding- the aftermarket stereo.
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#9
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Idle RPM sensitivity to signalling?
I have seen that when the body loses it's ground.
The GM's usually have a mesh strap from the bell housing to the body with a small black wire from the battery post to the body. When the mesh strap goes, the small wire will be severely overloaded and will usually start to melt the insulation before it burns up and the vehicle dies. Mike 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's Canadian Off Road Trips Photos: Non members can still view! Jan/06 http://www.imagestation.com/album/pi...?id=2115147590 (More Off Road album links at bottom of the view page) Aaron407 wrote: > > I have a 95 Grand Prix GTP, and if I'm signalling at idle (in gear, my > foot on the brakeat a dead stop) my RPM decreases by about 50 RPM when > the signal light is lit and cycles back up when it turns off and > continues during the periodicity of the signalling. My dash lights also > slightly dim with the same trend. My question is, is this normal? > Should the engine idle and interior accessory lights really be this > sensitive to such a small electrical draw? I have checked my battery at > idle and it's charging at 13.8V, and I haven't had any other electrical > problems. However, I do have some other erratic idling when not > signalling, so if this could all be attributed to the same electrical > problem I'd love to figure it out. Thanks. > > 407 |
#10
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Idle RPM sensitivity to signalling?
Thanks, I'll have to check that out!
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