Question about 2005 Chevrolet Equinox

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Engine miss disgnostic was 395 cpc dealer performed test compression test ok vacuum erratic and engine shake/vibration #4 clinder has low pressure recommened new egine

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Knock sensor was chainged but the check engin light is still on my 2005 equinox is missing when going up hills at about 65 mph pleas help.

Posted on Sep 18, 2008

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I changed the spark plugs in my 2002 buick rendevous now it missing. i checked the vacuum hoses all was ok.wat else could cause this problem


You have an "Engine Miss" and even after replacing spark plugs, wires, upper and lower manifold gaskets, and push rods, the Engine Miss still remains. You may want to stop and run a compression test. This test will give you a base line. If one cylinder has low compression, you won't get rid of the miss until that is fixed. Please write back with all the specific information regarding tests, all symptoms (is the engine light on and if so what are the codes?). The more tests that you perform the more you will know and will narrow down your search. All types of things will cause a miss. Take a look at the spark plugs and wires, just because they are new doesn't mean that they are not defective, also check the EGR valve, 02 sensors and exhaust back pressure, clogged filters (fuel&air), defective coil, TPS sensor, PVC valve, or timing. Please let me know if I can help you some more, good luck.

Mar 05, 2014 | 2002 Buick Rendezvous

1 Answer

Vw petrol engine missing on two cylinders


Do a cylinder leak down test for leaking valves
or at least a compression test

Also use an Evap Smoke Machine to check for
vacuum leaks

Is the misfire- a fuel,ignition ,vacuum problem
or timing problem

Mar 08, 2013 | Cars & Trucks

1 Answer

Missing


engine missing could be caused by faulty spark plugs and wires,bad ignition coils,dirty fuel injectors,leaking egr valve,low cylinder compression,intake vacuum leaks.many things will cause engine to miss, first do minor fix,replace distributor cap and rotor,replace spark plugs and wires,clean fuel injectors,replace fuel filter and air filter,if this minor tune up dont help engine and engine still missing, do a vacuum test and compression test to check condition of engine.engine could be worn out have low compression by worn valves and pistons rings.

Jan 04, 2012 | 1995 GMC Jimmy

1 Answer

1992 honda accord ex 2.2L \r\nStarts. and run s OK till engine warms-up then it lacks power and idles rough? Service engine (yellow light) comes-on after engine gets warm! Red oil pressure light also...


Hi. This issue has several causes, but the oil light indicator is a strong sign of low pressure in the engine. This will cause the engine lubrication rate to drop, thus, producing a illuminated oil light, and erratic Oil pressure readings. The necessary actions are to have a manual oil pressure test ran on this engine, asap. When running a manual oil pressure test, you will discover if the true oil pressure is low, or normal. If the test proves that the oil pressure is, indeed, low, this will confirm that the Oil pump is suspect.

Now, if the true readings given during the manual oil pressure test are indicating that the pressure is normal, this will be the result of a failed sending unit(oil pressure switch). Although the oil pressure is suspect, this is not your only issue here. There seems to be a abnormal compression rate, present. This is causing the rough idle, and erratic RPMs. I recommend to administer a engine block compression test, as well. This test will discover if , indeed, there are issues within the cylinder heads, and block structure, such as a worn head gasket, cylinder wall issues, and cracked block. Normally, these issue will send signs, like white, or gray smoke out the tail pipe, or discolored oil. It will, also, promote erratic RPM ratings, and a rough idle. Have the oil pressure test, and engine block compression test ran, asap.

Once the test are administered, you will be able to isolate the actual problem areas, more accurately. Check the spark plug wire sets, and ignition assembly for faults, also.

Apr 09, 2011 | 1992 Honda Accord

1 Answer

Engine shut off willnot crank after heating up geting code 34


DTC - 34 MAP Sensor Circuit Error (Signal Low Indicating High Vacuum)

The ECM uses the Manifold Absolute Pressure (MAP) sensor as an indication of engine load. High voltage would indicate low engine vacuum and higher engine load. Low voltage would indicate high engine vacuum and lower engine load. The ECM uses the information from this sensor to help calculate fuel delivery and spark timing.

Fault Code Description:
* 34 - MAP sensor circuit error (signal low indicating high vacuum)

Symptoms:
* Poor engine performance
* Engine running lean (not enough fuel, hard starting, lack of power)

Common Problems:
* GM MAP sensors do not commonly fail
* Due to erratic engine vacuum, other engine performance problems can cause a code 34 to set


Good luck (remember to rate this answer).

Mar 20, 2011 | Buick Riviera Cars & Trucks

1 Answer

Stopped at light. Oil light came on engine died. Restarted no power real rough. Won't idle. Is there a safety shutoff on loss of oil press. Any suggestions. 1997 3.1 lumina


Hi. This issue has several causes, but the oil light indicator is a strong sign of low pressure in the engine. This will cause the engine lubrication rate to drop, thus, producing a illuminated oil light, and erratic Oil pressure readings. The necessary actions are to have a manual oil pressure test ran on this engine, asap. When running a manual oil pressure test, you will discover if the true oil pressure is low, or normal. If the test proves that the oil pressure is, indeed, low, this will confirm that the Oil pump is suspect.

Now, if the true readings given during the manual oil pressure test are indicating that the pressure is normal, this will be the result of a failed sending unit(oil pressure switch). Although the oil pressure is suspect, this is not your only issue here. There seems to be a abnormal compression rate, present. This is causing the rough idle, and erratic RPMs. I recommend to administer a engine block compression test, as well. This test will discover if , indeed, there are issues within the cylinder heads, and block structure, such as a worn head gasket, cylinder wall issues, and cracked block. Normally, these issue will send signs, like white, or gray smoke out the tail pipe, or discolored oil. It will, also, promote erratic RPM ratings, and a rough idle. Have the oil pressure test, and engine block compression test ran, asap.

Once the test are administered, you will be able to isolate the actual problem areas, more accurately. Check the spark plug wire sets, and ignition assembly for faults, also...

Feb 20, 2011 | 1997 Chevrolet Lumina

1 Answer

My engine keeps shaking. The RPMs go up and down. Sometimes it even stalls.


ENGINE LOPING CAUSED BY.LEAKING BY VACUUM LEAKS AT THE INTAKE MANIFOLD.CHECK ALL BOLTS ON THE INTAKE MANIFOLD TO MAKE SURE THEY TIGHT.YOU COULD HAVE LEAKING EGR VALVE OR PLUGGED PVC VALVE.DO A COMPRESSION TEST TO CHECK FOR LEAKING HEAD GASKET.DO A FUEL PUMP TEST CHECK FUEL PRESSURE.IT SHOULD BE 35 - 45 PSI.IF FUEL FILTER HAS NOT BEEN REPLACED.REPLACE IT FIRST IF FUEL PRESSURE TO LOW.DIRTY FUEL INJECTORS WILL CAUSE LOPING.TIMING CHAIN WORN.IGNITION TIMING OFF AND WORN LEAKING VALVES.AND WORN CAMSHAFT LOBES.ALL ABOVE WILL CAUSE ENGINE LOPING OR SHAKING.

Jun 17, 2010 | 1998 Ford Explorer

3 Answers

99 dodge caravan #4 cylinder misfires, i replaced spark plug wires and spark plugs. Scanner showed #4 still misfiring, could this be the coil?


It could very well be a bad coil pack,or you have low compression in that cylinder.If the compression is good then go with the coil pack,if not you may need a head gasket or an intake manifold gasket.

Nov 07, 2009 | 1999 Dodge Grand Caravan

1 Answer

Rough running, erratic spark


Run a compression test on the cylinders.If reading is low on any drop a little engine oil into the pot. If compression rises you have compession ring problems. Remove all plugs before you try this and place leads away from engine.

Mar 04, 2009 | 2000 Ford Ranger SuperCab

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