Nissan :: 1993 - RPMs Drop When Braking And / Or When Under Electric Load
Feb 18, 2013
I have a 93 Nissan 240sx that exhibits weird electrical behavior. I've had the battery and alternator checked at two local Advance Auto Parts locations with results indicating no problems. The car starts and drives fine. Immediately after start, my automatic seatbelts are engaged and the RPMs drop to about 400 and the car shakes violently (while pressing brakes and even when not pressing brakes). RPMs drop anytime accessories are in use. When braking at a stop light, the RPMs drop and the car shakes again. Using my headlights causes the RPMs to drop but not a point where I feel shaking. The problem is worst at night when I am pulling up to my apartment complex with lights on, braking, and using my power windows to access my gate card reader. I don't know if this problem is related, but when I am listening to the radio and turn the volume all the way up, the radio keeps cuts on and off. I have a suspicion it's the grounds, but before I start tracing all my wires. I'd like to hear everyone's input. I determined it was the brake booster vacuum because it also happens when not using the brakes and pinching the line has no effect on idle.
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Engine is a high mileage (over 150,000) one. Truck is manual transmission. Above 2000 RPMS, low rumble noise and vibrations felt through gear shift lever. Only hear it when engine under load. I think its worn crank bearings... 1993/3.9 Dakota ....
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I have a 1993 Jeep Wrangler 4 cyl. When I am downshifting, the rpm's will drop to very low levels 100 or so and even die on me. If I feather the throttle a bit while I engage the clutch, the rpm's will stay up and the Jeep will not die. I have changed the air idle control valve, plug wires, cleaned the throttle body, oil change. The a/c condenser will disengage when the rpm's drop that low and reengage once I get the jeep moving again. Since I use it for city driving, the problem is exacerbated at every light.
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95 explorer 4.0l ohv. I go to take off and then come to a stop after about 10-15 feet, i just give it a little gas then lightly press the brake, rpm's drop to around 400-500 then back to normal. I have replaced:
IAC
MAF
Plugs & wires
Coil pack
intake manifold gaskets
fuel system cleaner
fuel filter
air filter
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Two weeks ago Sun, truck ran fine, however Mon morning all hell broke loose. Truck was running very sluggish and stalling while coming to a stop. My first thought was tune up. I replaced the plugs and wires. During this I found that i could not get a socket around the ever loved driver side rear plug so i was only able to replace 7 plugs however in that process i managed to break the metal coolant tube that runs to the heater core.
Aday later replaced the entire intake manifold,egr valve, egr tube, IAC valve, both coil packs, fuel filter, tranny fluid and filter. During the removal of the intake i looked at the rear spark plug and found that a screw had been wedged into the hole breaking the plug and got it changed now it is all back together and the truck runs amazing however did not solve the low rpms during stopping. ive replace the above and checked fuel pressure which is good.
I have a TPS sensor just haven't installed it yet not sure if it is related to the issue. Tranny guy says it may be a bad solenoid or TC however last night I reset the PCM and drove it it ran flawless. this morning the problem returned which leads me to believe its not the tranny. ok one last kicker that 6 experts have failed to answer when i manually put the truck into 2nd gear the engine dies! no studder no fighting just quits.
Truck is a 98 F150 4.6 V8 186,000 miles i have yet to
1) change TPS.
2) clean throttle body.
3) clean MAF sensor. n
Not sure if any of this has an effect on the issue. There is only a EGR insufficient Air flow code..
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I have a weird issue with my 2002 4x2 manual Nissan Xterra...when I drive along (usually happens when I'm in 3rd or 4th gear), and depress the clutch pedal to start slowing down for traffic, while the gear lever is still in the 3rd or 4th gear position, the rpms start coming down as the car coasts, but then a strange grinding/whirring/grumbling noise starts happening. The noise immediately goes away if I pull the gear lever into neutral, OR if I re-engage the clutch to start accelerating again. So, it only happens when BOTH the clutch pedal is depressed, AND the gear lever is "in gear". What could this be? The car has about 115K miles, but I believe the previous owner changed the clutch recently (80-90K), and the clutch itself feels fine.
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I have a 93 S10 blazer that has electric 4X4 shift. The only way it will shift into 4X4 is to come to a complete stop put truck in neural and hit the 4X4 low then both lights flash then both lights remain lit then i can hit 4X4 high both light flash again I hear 4X4 module click and front axle engage but I'm not sure of its in 4X44 if I hit 4X4 hi again both lights flash again and I hear the clicks but when u go 2 drive its like its in super super low gear if u don't put truck in neutral and come to a complete stop no matter wat button hi or low u hit nothing will happen.
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I'm getting a weird code on my engine it's p1298 which is electric load detector circuit high input and I'm also getting 3 misfire codes but the car runs great what can I do to fix these.
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Recently bought a 2006 RX400h - my first Lexus. Occasionally when braking it feels like the electric motors "won't release" for a second or two and the car lurches. Eventually they do and then braking feels normal. But while this is happening it feels like I have to really step on the brakes to get it to stop.
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So I've had a problem with my celica. I've changed the vsv and the vacuum switching air control valve (Vsacv) ... I think the Vsacv went out already. New timing belt.. Engine is timed 10btdc. Cleaned intake and checked all vacuum lines
So the problem is that my Car idles at 2200 and will not drop unless I adjust the dist. Then the car bogs out. Put a new tps on last year which fixed the crazy idling but didn't fix the high idle... And it only drives good when the idle is that high....
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I have a 1993 Lexus SC 300 and have met all maint milestones. Recently had both rear shocks replaced and am getting a SHARP metal contact in the left rear when the suspension begins to load. Mechanic spent afternoon looking in shock mount, trunk, spare, jack, spare and antenna mast-can't find it. New tires. New rear brakes-told me that was it. Still there.
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I have a 1994 dodge ram 2 wheel drive with a 318. Idles fine but when put under a load it starts surging and bucking at about 1500 rpms. Idles at 1500 no problem only under a load...
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It's starting to get warm again down here and I've started running my AC in the afternoon on my way home from work. I've noticed that as soon as I get off the freeway and sit at idle waiting for the light, the RPM's on my car drop considerably while the AC is engaged. I know there is a valve, AC idle-up valve or some such thing, that increases the idle when the AC is engaged. Where is it located and what is the proper name/part number so I can check or replace it? Haynes isn't supporting.
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Can't run a/c rpms drop to almost 200 from 1200-1500rpms. Really bad when at at traffic light. I have to constantly press gas pedal.
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First off, vehicle is a 1993 Volvo 240, 5 speed with 131,000 miles
1) Temperature gauge is reading hot, but I believe it's running at a normal temperature. I read a few things discussing this issue. First off, a yellow wire that runs through the firewall becomes corroded (as do all Volvo wires of this age!) What exactly is this wire and what does it lead to? Could I just rerun that wire with possibly a thicker gauge? My dads an electrician so no worries with the wiring. More commonly, however; I read that the temperature compensation board fails and gives erratic readings! is this board expensive and how difficult is it to replace? I have experience with this dashboard because I rebuilt my odometer and installed a tachometer, that gives you my basic level of expertise.
2) My passenger side rear fog light won't work, a new bulb didn't fix the problem, what could it be?
3) My car shakes kind of vigorously while braking, especially at LOW speed!? I replaced front pads and rotors, what else could the problem be?
Volvo.jpg ( 2.19MB )
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1997 200 SX SE coupe. It has the 1.6L engine and is a 5 speed.
I recently purchased this car and it had the CEL or check engine light on. The part store stated the codes were: P0304 X 2 and P1445.
Here is my problem that occurs mainly once the engine is warmed up- it started bucking and hesitating whenever I push the gas pedal. It doesn't do it when the engine is cold- at least it is very slight and hard to notice. On the highway at constant cruising speeds the car rides and purrs great. While I'm idling at a red light the rpm is constantly dropping about 100 rpm every second.
I have tried the following:
-Replaced distributor cap. The cap was slightly corroded.
-Tested spark plug wires by applying then to metal and looking for spark.
-Did a dry compression test and all cyl ranged from 150-160 psi. (Good levels??)-
-Sprayed carb cleaner around manifold to see if idle changes - nothing
I am fairly a novice at mechanics so I'm still learning. Perhaps the car has stale gas? Not sure how long it has sat, or even if it has been sitting. bad injector? Bad fuel pump/ filter?
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When your car is idling the rpms drop below 600rpm and you can feel like its going to stall but then goes normal. How do i fix this? Clean throttle body???
Also how hard is it to change the transmission fluid? Possible to do it at home?
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I have a 98 1.8t TIP and this problem just started happening when I slow down to stop the rpm's drop and it almost dies but it catches it self and the needle bounces a few times and it is fine after that.
Also when I start the car the rpms bounce like three or four times but it again, catches itself and its fine after that... until i want to come to a stop again.. I live in the city and its a lot of stop and go.
Also when i slow down it feels like my car slams into first gear. it shift perfectly every other time up and down, only when it goes into first it hits hard and scares me cause I don't want anything to go wrong.
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So yesterday evening I was driving home and I noticed this clicking sound like a relay clicking on and off every time my RPMs go above 3k then drop below 2500. I am at 9Kish on the OD so I am just gonna let them know at the 10K oil change. Whatever it is or does, it isn't affecting the cars drive-ability one bit.
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2011 Sonata GLS, 95,000 miles.
This just started yesterday. While driving, the RPMS suddenly drop off. Depressing the gas pedal doesn't command any power output, even if I floor it, the RPMS continue decreasing and there is absolutely no power. The only way to keep moving is to completely release the pedal and then depress it again.
The transmission has been serviced twice by me and shifts smoothly. Should I plug a scan tool in ?
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I'm in the military overseas and having a starting problem with my 2006 Ford Five Hundred. When the weather is cold, around 45 degrees F or lower the car starts OK however within about a second the RPM's drop between 400 and 500 and the engine starts to stumble. After about 3 to 4 seconds the RPM's gradually increase to around 1300-1400 RPM and is OK at that point.
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