Question about 1987 Isuzu Pickup

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MY TRUCK HAS A 2.3 4 CYLINDER.. IT RUNS GOOD BUT I HAVE A KNOCK IF I OVER OVER WINE THE MOTOR. I CAN UNDO THE VACUUM AN IT WONT KNOCK

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The removed vacuum may keep the timing retarded to prevent spark knock from winding the motor on low octane gas

Posted on Oct 08, 2010

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Posted on Jan 02, 2017

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If I drive my 2007 beetle at or above 2500rpm for 10 minutes or more, and then slow down, I get smoke out of the exhaust - but only in the low gears (1,2,3) and only for a few days.


the symptom indicates failed valve stem seals
by deceleration , there is a vacuum created in the cylinders and that is sucking oil past the valve stems
the low gears is the highest vacuum creation as the engine is running at high rpms and when the throttle is closed the vacuum can go as high as 25" mercury in the manifold and cylinders
oil can also be drawn up past the oil control rings
the indications are that the motor is a bit worn but I am staying with failing valve stem seals or worn valve guides
a knocking sound on deceleration is worrying as it could be first signs of bearings or gudgeon pin problems
have a full wet/dry compression test done on the engine to determine condition
also have a mechanical oil pressure test done to determine oil pressure in operation conditions

Oct 02, 2016 | 2007 Volkswagen New Beetle Coupe

1 Answer

How to knock sensor location


you didn't state specific engine so here is a run down of locations
on a 4 cylinder engine there are 2 knock sensors located on the inlet side of the block adjacent to no 1 and 4 cylinders ( cross way motor)
on a v6 engine( crossway engine) they are in the valley of the block ( probably under the inlet manifold system) at 2 and 5 cylinder positions
on a v8 they will be located adjacent to 4 cylinder and between 6 and 8 cylinder on one side and adjacent to 3 cylinder and between 5 and 7 cylinder on the other side

Nov 22, 2014 | 2000 Toyota Land Cruiser

1 Answer

My 2004 chevy trailblazer is knocking


could be a big end or main bearing but there are a few simple checks that can be done first
1--have the oil pressure checked using a mechanical gauge
if there is a bad bearing there will be low pressure at idle
2 --check the exhaust for smoke under load
if there is a bad bearing , the escaping oil will overload the oil ring and produce smoke
( if smoke comes after idling at lights and on taking off that is valve stem seals)
3--- run the fault codes and check for knock sensor problems
the noise could be detonation under load from lean fuel mixture or incorrect timing
4---check the ignition timing
5-- run the engine when it is knocking and remove a plug wire and see if the knocking stops
bearings will stop knocking if there is no combustion to place load on the crankshaft
That will also indicate which big end you have to check if you have to pull the sump
Too far advanced will cause the pistons to slap the cylinder walls hard for too far advanced ignition
you statement that the noise goes after 40 indicates that it is not a bearing as the high the rpm the louder the noise
taking the foot off the pedal indicates detonation
lastly if all the checks prove good , you could always have the sump removed and check each big end and main individually for damage
sometimes a failing cam chain if fitted ( no motor identified) will knock as the chain hits the timing cover

Jul 23, 2017 | 2004 Chevrolet TrailBlazer

1 Answer

03 nissan 350z w0nt idle & stalls


YOU HAVE A VACUUM LEAK OR THE IDLE AIR CONTROL MOTOR ISNT FUNCTIONING OR NOT PLUGGED IN.POSSIBLE PLUG OR PIN DAMAGE IF PLUGGED IN.

Oct 10, 2012 | 2003 Nissan 350Z

1 Answer

I have a 1988 ford f150xlt lariat fuel injected wont run no fuel, any idea??


did the crash fuel pump shut off get knocked from a large bump?push the button and retest if

Sep 18, 2012 | 1998 Ford F150 Regular Cab

1 Answer

I have replaced the Master Cylinder (bleed before putting on car), bleed the brakes as well as pressure bleed, replaced buckets in the slave cylinder, replaced rear shoes, no air in line, however while the...


Your brakes are vacuum aided so when engine is off the pedal will be hard. When the engine runs the vacuum is active and the pedal becomes light. Your brakes are working but need adjustment so that the pedal does not go to the floor.
Locate the adjusting screws behind the rear wheel drums.
With one wheel jacked adjust the shoes till wheel wont turn.
Then loosen until wheel is just free of any friction from shoes.
Repeat for other side.

Sep 20, 2011 | 1993 Nissan Pathfinder

1 Answer

Knocks at ilde,, changed knock sensor on hooked tourge converter, belts and let run free still knocks at idle


You have carbon build up on the valves and pistons to get rid of this you will have to buy some Top engine cleaner and hook a vacuum hose to the can where it pulls the fluid into the cylinders say a brake vacuum boost . or a line in from the throttle body. After you get it to **** it all the way in shut the engine off for 30 minutes and let it soak. then fire up the engine and run it till it quits smoking, this should get rid of the engine knock. Since the carbon builds up inside the compression chamber it raises the compression ratio to a point that the knock sensor can adjust the timing to keep it from knocking, this is a problem for GM cars but also for all cars that have to burn Alcohol or ethanol and it's the only way to get it out without tearing the engine down. also once you are done you will need to change the motor oil and filter cause the carbon will plug up the filter.

Feb 10, 2010 | 1999 Pontiac Grand Prix

2 Answers

Diagram of 3.4 DOHC Motor online


Both knock sensors are screwed into the side of the cylinder head between the front 2 cylinders.

Jun 22, 2009 | 1996 Pontiac Grand Prix

3 Answers

Knocking in motor whe ni first start it


have the knock sensor tested if it out then the pmc wont regulate the fuel goin into the injectors

Jan 06, 2009 | 2001 Chevrolet Silverado 1500

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