rpm drop when braked

[Ryencool]

No matter what gear im in or neutral if i hit the brakes when im at a dead stop my rpms drop 200 or more, somtimes after a high rpm run down to a full stop the car will die when I use the brakes..I have to featehr the clutch and gas in between braking to keep it from stalling when trying to stop..vaccum leak? head gasket? anyone??

[Ryencool]

??

[Guest]

i have that same problem, try and see if anyhting else will do this, ie turning on your lights, high beams, anything that uses energy. I just think i need a new battery? i dont know, thats just what i think it is anyway, ive left my lights on and killed my battery too many times for it toobe ok":P

[HRO]

Same thing happened in my sunbird, and it was the O2 sensor.

[mx3man83]

so your saying the o2 sensor is bad if the RPMs drop when an additional electrical load is placed on the engine?? To me that seems unlikely, but hey you may be right...i'll have to loook into that since my car does the same thing, just not as bad...mine doesnt come close to stalling, but it is noticeable..

[Guest]

might be the EGR system, i know mine is messed up and every time i come to a stop at a light, my rpms drop to almost stall, then they come back up, sometimes its fine, sometimes it does it lots, and the check engine light will periodically come on and off, so check that out.

[Taras]

You should be more specific as to if your gear is engaged or not, do you keep youf foot on the cluth and brake at the same time. Electrical load? Modified ECU. Could be a few things. Neutural switch, ECU to ****, poor grounds, clutch switch. One of the easy things you can do test all switches for proper voltage when engaged or disengaged, change your ground wires in the engine bay to thicker gauge or even clean existing ones.<P>Good luck<BR>TT

[Ryencool]

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by Ryencool:<BR><STRONG>No matter what gear im in or neutral if i hit the brakes anyone??</STRONG><HR></BLOCKQUOTE><P><BR>thought that expalined it, its when the clutch is engaged or dis engaged, doesnt matter...wish there was a definite fix for thism from 02 sensers to egr to grounds, thats lot of checking..

[Taras]

If you are in Neutural with car idling and you apply brake pressure, your rpm drops, right? Tape the brake swith (up under dash where pedal is) apply brake. If RPM drops you are looking at vaccum leak, brake booster hose perhaps. If RPM does not drop, you have electrical load problem. Check your grounds, or brake switch. Just a few ideas to think of.

[Cheeto]

My 92 mx-3 was doing the same thing, did some research and found something in a book, it said to replace the electronic control module. got it at canadian tire for like $120 bucks works good now

[Ryencool]

ecm = ecu, same thing, jdm what did you mean tape what under the dash??

[tk1138]

This is just a case of the idle problem. Try the solutions to that e.g. alt/batt, clean intake components (TB, IM & Check the head), reset your ECU (disconnect battery for 20 sec).

[david103]

also, make sure there are no tears/rips in the intake hose behind the MAF. it's a common problem with mx-3's.<P>dave