1990 Honda Civic "vacuum bounces" Questions

...should be bouncing from 250mv up to 800mv. a major cause of a lean condition like this is a vacuum leak. check out all of your vacuum lines. this sounds like it would be the most likely ...

...mostly culprit though is timing bad,,,, bad timimg gear/belt/chain which ever is in yours. vacuum line loose or has hole in it, (note: check your pcv line/hose

...bounces back and forth below 500. had a few issues with the temperature sensor that caused this type of problem,also check the temperature driving. Does it heat up to mid gauge or does it stay low or ...

...steady right foot) no hills. Misfire, : Bad engine, bent a valve> do to ignoring the belt. got vacuum bounce? bad spark bad injection rates, or injectors clogged ,dead or weak or leaking. me, i ...

...vacuum pump. Now when I hooked a tester gauge it bounces back and forth to normal area. The motor was running and I hooked the gauge at the brake booster. Is that normal with the motor running? Did I ...

...the oil needle bounces up it down when the rpm's get to the lower side. Could be as easy as a vacuum hose problem. Spray carb cleaners around all vacuum lines and see if any noise or changes ...

...between 500-1000 rmp and occasionally the engine dies The common problem sounds like you may have a vacuum leak, check for broken or poped off vacuum lines,this is where i would start the next step ...

...because it feels like a trailer bouncing around back there. Trailer hitching is usually caused by a vacuum leak, either internal or external. It could be a bad vacuum hose, a sticking EGR, and intake ...

...psi, replaced crank sensor with updated cps, No signs of fuel coming out of regulator, no obvious vacuum leaks map sensor drops about 1 volt per every five pounds of vacuum. Iac seems to be ...

...vacuum steady never bouncing. if it bounces head valves, bad, or ? ok. in addition to Cadavers suggestions i would go further and have the crank sensor checked or more like replaced. This sensor is ...