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1998 chevy Z71 / changed plugs and wires/changed fuel tank pressure sensor/checked all plug wires for fire/diagnostic check says pass. Idles fine but shakes violently when put in gear. Out of options. this problem occured quickly while driving.

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Spark knock sensor is at fault

Posted on May 29, 2010

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2003 chevy blazer ran fine all at once engine went sluggish idles okput in gear engine rocks


Sadly, there is no "magic fixit" button on your vehicle.
Standard diagnostic procedures include:
  1. Replace the fuel filter. (Go ahead, just do it... likely your issue);
  2. Check fuel pressure at the fuel rail. If fuel pressure is inadequate or varies, begin by replacing the fuel pressure regulator. Also, verify operation of the fuel pump and make sure the fuel intake strainer in the gas tank is free of debris;
  3. Your fuel may be contaminated, especially if you have been using ethanol blend fuel. Replace all fuel in the system with ethanol-free fuel if possible. If you cannot find ethanol-free fuel, use a FUEL SYSTEM WATER REMOVER with each fill-up;
  4. Check for adequate spark. If spark is inadequate, troubleshoot the ignition system. Perform a major tune-up, including new spark plug wires and coil pack(s).

May 11, 2015 | Cars & Trucks

1 Answer

2000 chevy tahoe z71 5.7 v-8 won't start. Turns over and fires but will not start. Check fuel pressure and it's 55 psi. WHat's next?


When you say it fires, are you checking for spark at the plugs ?
In most cases you have to figure out if it is spark, fuel, or compression to proceed. A mechanic would also check the computer for trouble codes but you would need a scanner or code reader to do that.

Dec 04, 2012 | 2000 Chevrolet Tahoe

1 Answer

When at a stop light the car idles fine when i go to take off it sputters and back fires. I changed the spark plugs, but it is still doing it. It idles fine otherwise.


Does not sound like ignition, but fuel.
Idle needs little fuel.
Could be a clogged filter, water in the gas, bad pump, vacuum building up in the tank, bad sensors, etc.
Start with a gauge on the fuel pressure.
If it is low, that will point to filter or pump. Filter is cheaper to try.
If not low, then check the sensors with ohmmeter from Harbor Freight for $3.
There are O2, water temp, MAS, air temp, etc.

Jan 21, 2011 | 2001 Suzuki Grand Vitara

2 Answers

Well i have a 1983 chevy s10 2.8 and its been broke down for awhile i just put a full tank in before i was having this problem the thing is it started just fine from the gas station and it was fine for two...


sometimes if a fuel pressure regulator goes bad , you will be able to smell fuel fumes under hood. a leaking pressure regulator will cause---hard starting, poor fuel economy, stalling, check engine light, gas smell under hood. also check all fuel lines under hood.

Dec 20, 2010 | 1983 Chevrolet Chevy

1 Answer

May 30, 2010 - MY TRUCK IS A CHEVMY TRUCK IS A CHEV Z71 1998 WITH 5.7 ENGINE THE WHOLE STORY IS THIS ...IT STARTED RUNNING ROUGH WHILE I WAS DRIVING HOME ON THE INTERSTATE IT WOULD NOT TAKE GAS BUT WOULD...


If you're smelling fuel, it's not getting burned. Something wrong with inginition. Examples, timing is off, need tune up, wires are wrong on truck, and more.

May 30, 2010 | Chevrolet 1500 Cars & Trucks

2 Answers

My truck will not start just cranks but will not fire


Air - not likely the problem ! mechanical cable controlled throttle body

Fuel- make sure there is gas in tank! fuel pressure test at the throttle body or rails, if no fuel check power to fuel pump: ignition power to breaker or fuse, relay , power to pump at 3 pin connector near tank/frame rail on drivers side, - if pump is runniig but insufficient pressure, check for mechanical restriction: plugged filter broken or pinched line, plugged pickup tube in tank. if good pressure to rail or body, check ecm : diagnostic codes, fused power, ecm tells injectors when to open, dependent upon several sensor parameter inputs.

Spark- ignition - coil-distributor-ignition module (or coil packs)- wires-plugs-ignition module (signals coil to discharge, mounted beneath distr cap) work backwards from plugs.

Jan 25, 2010 | 2000 Chevrolet Silverado

2 Answers

1997 K1500 z71 4X4 Chevy (Throttle position sensor)


does anyone know where the throttle position sensor is located on a 1997 chevy Z71 truck ?

Jan 19, 2010 | 1997 Chevrolet K1500

3 Answers

1998 Chevy s10 4 cylinder running rough


One thing to check is the fuel pressure regulator.
If the diaphram is leaking it will cause gas to be pulled into the vacuum system causing lots of white smoke and extreme rough running.

Mar 03, 2009 | 1998 Chevrolet Cavalier

1 Answer

1998 Chevy Cav.


The reason you have that code is because the engine is running rich. I would pull the plugs out and check them also check the plug wires. also when have you changed the fuel filter. check the fuel pressure may have a bad pump.

Feb 09, 2009 | 1985 Chevrolet Chevy

1 Answer

1998 Pontiac Sunfire won't accelerate


I assume that you do not have a "check engine" light?

The next thing I would do is check the pressure from the fuel pump. You can have this done at your preferred garage, or by purchasing a fuel pressure gauge from any parts store.

Vent the fuel tank vapors by loosening the fuel cap. Remove the electric fuel pump fuse and start the engine. Allow the engine to run until it runs out of fuel and stalls. After spinning the engine over for a period of 3 to 5 seconds, turn off the ignition switch and install the electric fuel pump fuse. Next, install a fuel pressure gauge in the fuel rail supply line, and secure the fuel tank cap. With the ignition key in the on position, verify that no leaks are present and start the engine. Visually verify the PSI reading on the gauge. The pressure for your vehicle should be 41-47 PSI (Pounds per Square Inch). Hope this helps and good luck!

Jan 13, 2009 | 1998 Pontiac Sunfire

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