will low compression cause rough idle?
159637
Bad compression is most noticable at idle and when trying to start the car. If it's on just one or a some of the cylinders it shows up with a rough idle or rythmic shake of the engine. It high RPM it is difficult to detect unless it's so bad that the engine misfires. You get very little power loss with low compression.
978485
['Decreased power when towing or going uphill.', 'Rough starts and shuddering idles.', 'Sluggish accelerating or a spongy engine response from the gas pedal.']
297314
If the throttle body isn't supplying enough air to the engine, you may see a lack of acceleration power and poor engine performance. 3. ... A faulty one can cause rough idle, or it can cause the engine to race at idle. It could also cause the car to stall.
569593
If this system is not functioning properly, the fast idle could remain on even after the engine is warm causing it to overheat. ... If there is an issue with this system, such as an intake leak, or faulty IAC (Idle Air Control) valve, there could be too much air getting into your engine causing a fluctuation in idle speed.
1319458
Low compression will not lead to a Check Engine light unless it is so low that it causes a misfire.
258762
Rough engine idle However, if the VVT solenoid is malfunctioning, it is possible that it will introduce additional engine oil to the VVT gears. This can cause the engine to idle rough, specifically the engine RPM to fluctuate as the system is activated.
1447257
there is at idle between 20-50 psi... but during use pressures in transmission lines can reach 100 psi or more. if you are going to use rubber lines be sure to use barbed fittings so the hose does not blow off.
999742
Low compression in one cylinder usually indicates a bad exhaust valve. Low compression in two adjacent cylinders typically means you have a bad head gasket. Low compression in all cylinders would tell you the rings and cylinders are worn and the engine needs to be overhauled.
223040
In fact, if you've noticed a rough idle, stumbling initial acceleration or even stalling – all when the engine is fully warmed up – a dirty throttle body could be the culprit. Once you look inside a throttle body, you will probably be surprised at the dirt, gum and varnish that have accumulated there over time.
1050465
If a cylinder has low compression, perform a wet compression test to indicate whether it's a bad valve, head gasket, or worn piston rings causing the problem. To perform this test, inject about a teaspoon of oil into the weak cylinder through the spark plug hole and screw the compression gauge back in.
1151581
Lower compression and more boost will always make more power, assuming you have enough turbo. It's a give and take kinda thing though. You trade response for power. So you want the highest base compression your fuel/boost level will allow without knocking to meet your power goal.
1308135
The PCV valve works in an extreme environment in your engine, and over time can get filled with sludge and dirt. This can cause the valve to become blocked and inoperative, or it may start to leak. A PCV valve leak can cause the air-fuel mixture to run too lean, and this will cause a rough idle.
1055938
New Member. A regular old compression test would do it. If the valve is bent there is a high probability that the compression in that cylinder would be really low.
1363425
Most likely you have a clogged (or failing) idle air control valve. Take it out, clean it, put it back… should solve the problem. There's a disconnect between the amount of air the computer thinks your engine is getting and the amount it's really getting, so it keeps trying to correct itself and almost dies/comes back.
1389974
One of the only problems that does affect unused AC is a buildup of dust in the system, or accumulation of debris outside. If you're about turn it on after it's been unused for a few months, here's what to do first: Walk outside and look at the compressor unit (the big outside unit).
734042
['Grime Build Up. ... ', 'Poor Fuel Economy. ... ', 'Poor or High Idle. ... ', 'Uneven or Slow Acceleration. ... ', 'Electrical Problems. ... ', 'Airflow Disruptions. ... ', 'Check Engine Light. ... ', 'How to Resolve Any Problems…']
1392265
Try lowering all settings to lowest. Try loading some old and light map, for example cache (or office even better). E.g inferno and nuke are very heavy. Check that you don't have many RAM using background processes on going same time.