Rover 75 v6 starts no problem runs 1000 rpm then

Has the throttle body been cleaned inside.Has the car got a vacum leak.Whats its servuce history

Hi
i didnt quite understand your problem but assume its regarding the brakelights not working when the engine is running.
Try disconnecting the brake light switch and bypassing the wiring. If the lights work..fit a new switch.

your enigine IDLE RPM is no longer in control.
the RPM dropped so low the Alternator can produce enough juice, current. diagnose, that first. at belt, is belt slipping>?
or is RPM dropping. it must not drop ,in fact most cars A/C on
raise idle speeds by 200 or so. is this gas or diesel.
im too lazy to look it up. 1.8
the charge lamp did not lie, voltage did drop below 13.3v. running.

check on Youtube

Depending upon how long it's been since your last tuneup (they do need tuneups at 100,000 miles, you might need new plugs and points. My 2004 had the exact same problem and it was completely resolved by changing plugs and points.

This sounds like the RPM may be a little high, but normal operation is called a "cold start routine". Like the old fashion Choke, the "cold start routine" is suppose to increase the RPM for several minutes and then decrease to running idle speed. This will engage in each "cold" start, but not on a warm engine. It is designed to do this.

Usually when an engine runs higher RPM than it is set for, it means extra air is entering the engine from somewhere. Using a spray water filled bottle, go around seams and also spray vacuum lines and the EGR pod while the engine is running. Any openings will draw in the water and affect RPM. Then you will have found the leak.

Now you can look up you exact engine on the Web and find out 2 things. If it has a 2 piece intake manifold and if it has intake Manifold runners. The 2 piece design often failed when the gasket holding the 2 halves started dissolving. The intake runners, could stick out of position and make RPM higher.

Now aside from these 2 items, you might get a Code showing that the engine is running lean. This would actually not be showing the lack of fuel, but the overabundance of air coming from the leaks.

which car is it?

problem with 1993 Geo Prizm '99 silverado 5.3 engin will not idle runs at 2500 rpm and drops down to 1000 rpm the back up to 2500 rpm -------------------------

No,only on carburated engines it,idles down to the set point,on yours,it's fuel injected,pushing gas pedal won't kick idle down,should go down after a certain amount of time,does it automatically,If you start and drive a 5 mile ride and stop at a stop sign,it should idle at it's set point if there's no engine problems,which may be.5 to .7 on your tac.When you normally first start,it will idle between 1000 to 1200 rpm's,don't push on gas,let idle say 15 seconds,put in drive and go.

check oil pressure switch located on side of engine block. not sure what side on a neon.

witch one do you need they are broken down in sections