Question about 1993 Chevrolet S-10

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What would cause truck to shake very hard or rough when starting?

Anytime i start my 93 Chevy s-10 2.8l v6 5speed truck the whole thing seems to shake very hard or "rough" heard it may possibly be exhaust manifold gasket not sure if that exists or not. any help appreciated.

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  • Chevrolet Expert
  • 242 Answers

I really need to know the mileage.....?..also the question isn't very clear ...Is the whole truck shaking roughly or is the engine shaking roughly or is it both the engine and truck shaking..?..Since I am not sure I will answer what I can....Ok......If the truck is shaking while sitting still at idle the engine/trans mounts could be worn and or loose mounting hardware...If the engine is running roughly at idle causing all to shake that bad it could be a number of things causing it as usual...Quite often a faulty plug wire/and or bad plug will make it have a misfire because it will be running on only 5 cylinders..If that's the case it could be more than one bad...A vacuum leak will cause it to perform in the same manner...however all cylinders will be firing..Normally a vacuum leak is easy to pinpoint..however it could be a faulty IAC valve..(IDLE AIR CONTROL)..The idle air control is designed to hold a high idle at start up then slowly bring idle down to proper Rpm.....A faulty TPS (THROTTLE POSITION SENSOR) will also cause a rough running problem..And let's not forget the O2 sensor..(OXYGEN SENSOR)..The O2 sensor controls air/fuel mixture...and yes an exhaust manifold gasket will make it run rough but not too bad...It has a rough running sound more so than causing it to horribly shake..It will shake but not to bad..
it is located at the exhaust side of engine..The exhaust manifold is mounted to the engine exhaust port..the exhaust pipe is mounted to the exhaust manifold and the muffler/cat converter is mounted to the exhaust pipe...You can check the plug wires quickly..With engine running carefully remove plug wires 1 at a time..If the sound of engine gets worse the wire you removed is good..after verifying it is good or bad plug wire back on then pull the next wire..and so on..If you pull a wire off and there is no change in engine operation that is the bad wire..If that is the case change all plugs and wires...One at a time..(It is a good idea to make sure all wires come off easily before starting engine..old wires will come apart easily..grasp wire tightly at boot and twist left to right while pulling..)as far as the other components I spoke as well as many others,the best,easy way is to have it hooked to a scanner and they can check/test all components for proper operation...Now..If it runs good but is shaking the engine/trans mounts are worn as I stated earlier..any loose engine component will cause an engine shake also but you should notice it at a glance...engine mount bolts/nuts being loose can be tightened without changing mounts if caught in time..Trans could be coming loose.also worn clutch will cause vibration...Send more info and I can guide you to remove and replace any faulty components you may find to save you money.........Brooks/Metalpoet.....

Posted on Jun 11, 2014

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Posted on Jan 02, 2017

csmock132
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SOURCE: 93' 4.3 chev runs rough at times

Have someone turn the key on while you watch the injectors. If any gas leaks out of the injectors, without cranking on it) replace the o'rings around the injectors.

Posted on Mar 12, 2009

  • 3 Answers

SOURCE: Rough idle, Car shakes, sputters and misfires upon acceleration

It sounds like you may have a problem feeding the fuel to your engine, I had the same problem with my 89 RS. All the 1989 model's fuel systems were recalled. I think you may need a new fuel pump. The fuel pump is located inside the gas tank in the rear of the car right under the rear axle. The fuel pump itself isn't too expensive, but with other small parts such as the electrical harness upgrade and fuel filter and the labor you should be looking somewhere in the $500 range. I hope this helps.

Posted on Jan 12, 2009

LT1Rob
  • 55 Answers

SOURCE: Torque Spec for '99 Chevy C1500 5.7L engine lower intake manifold

On 5.7L engines, install the bolts and torque in sequence as follows:

  1. Step 1: 71 inch lbs. (8 Nm).
  2. Step 2: 106 inch lbs. (12 Nm).
  3. Step 3: 11 ft. lbs. (15 Nm).
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Posted on Mar 14, 2009

c17hydro
  • 2984 Answers

SOURCE: Shaking in my 86 chevy s10 blazer 4x4 2.8

U-joints.....seems like your vehicle wants to launch off the road?

Posted on Mar 22, 2009

  • 14036 Answers

SOURCE: 2000 chevy lumina. Is fan supposed to come on when car started

no fan comes on when engine cold start up .but it will come on when you turn on air conditioning or defrost on .if engine idling a while when temp get 190 degree the fan will kick on.if over heating you got air in system .wait until cools check coolant add more .crank engine let it idle few. minutes when start warming up turn off engine wait a while before removing radiator cap so you wont get scald.add more coolant .crank it again starting warming up turn off engine wait a while .add coolant .keep doing this procedure until your coolant stop dropping off .if you do this more than 6 times you got a leak some where.check crank level for signs.if oil level higher than normal.if everything looking good.when engine cool make sure add coolant to over flow jug cold level mark.

Posted on Apr 28, 2009

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