My engine does not run smooth in the 2500-3000rpm range, also idle is not perfect Specially in fifth gear it is most noticable Apart from that it is pulling strong up to the redline I have checked the ignition, this looks Ok, plugs and rotor arms have been replaced Now I am in the process of checking if there are leaks in the inlet manifold I have disconnected the brake servo tube and am blowing air in the manifold there Have only tried blowing air myself but there is not a lot of pressure build up I wonder how much pressure I can/must apply before I will use the compressor If there are no leaks I will check the valves There were done 5000kms/15yrs ago before I bought the car Thanks for responding Frank
I have used a compressor to blow air in the manifold Turns out there is no pressure buildup No idea where it is going to Will try to find out in the weekend Can it be the air is escaping through the exhaust because there is valve opening overlap Can be the intake but the throttle valve and the CIS air flow sensor plate are closed This should restrict the flow Anyone??
OK, let's start with the basics: Rough idle Rougness in the 2500-3000 RPM range Lack of power under load in 5th And it's pulling stong??? OK Personally, I'd visually and electircally inspect both the plug wires and spark plug extenders. These are high failure rate components and a well-known, well-documented source of many, many...and many issues such as what you describe. In terms of "blowing compressed air into the intake manifold to determine ??? (vacuum leaks???), this is not a valid, or viable test, as at any given point in time, multiple intake valves will be open. If the ignition components prove to be good, then have the injectors "pop tested" and then go from there... Best, David