Question about 1990 GMC Sierra

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Truck keeps dying and running rough. i have already changed the plugs wires distibutor cap rotoray button pcv valve tested the ignition modulelator and got a mew coil. what could it be

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Check the fuel pressure. Possible bad fuel pump.

Posted on Nov 07, 2010

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Please Help!!! Replaced ECM and truck immediately dies


Have checked the idle air control valve. If stuck closed it will not allow air to bypass the throttle therefore it will start and stall.

Jun 08, 2013 | 1990 Chevrolet C1500

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I have a 1990 mitsubishi might max it wont run smooth unless you keep your foot on the gas and keep the rpms up a little bit and it wont drive cause it stalls everytime you try to move it. ive replaced the...


You've already eliminated the spark plug & wireset, distributor cap & rotor.
Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.

Components checked/replaced during a tune-up are:
air filter
motor oil
motor oil filter
breather filter
fuel filter(s)
fuel strainer
PCV valve
EGR valve
spark plugs
spark plug wires
ECM or distributor cap & rotor
cabin air filter
transmission oil filter
transmission oil
engine coolant
check all vacuum hoses and lines

Troubleshooting the no-start condition - from the 1990 Mitsu Mighty Max Repair Manual:

Priority Action Part Type -- Cause
1 Inspect Battery -- Battery Discharged or Faulty.
2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable.
3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned.
3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter.
5 Inspect Ignition Coil -- Faulty Ignition Coil.
6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s).
7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s).
8 Inspect Starter -- Starter Motor Faulty.
9 Inspect Fuel Pump -- Low Fuel Pressure.
10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch.
11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay.
12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator.
13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch.
14 Inspect Starter Drive -- Faulty Starter Drive.
15 Inspect Fuel Injector -- Dirty or Worn Fuel Injectors.
16 Inspect Fuel Pump Strainer -- Clogged or Dirty Fuel Pump Strainerat.
17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC.
18 Inspect Fuel Tank -- Fuel Tank Empty.
19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke.
20 Inspect Distributor -- Worn, Loose, or Incorrectly Installed Distributor.

Aug 17, 2011 | 1993 Mitsubishi Mighty Max

3 Answers

What is needed for a tune up?


Thanks for choosing FixYa and welcome. For a tune up, you would need to change spark plugs, coils, distributor cap, coil pack, and wires. You would change the air filter and the fuel filter also. Change your pcv valve as well. You can also change all your fluids and filters, such as oil, coolant fluid, and transmission fluid.

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I followed the firing order installing a dist cap on a 91 camaro and still running rough What do I look for now


check plugs -plug gap-vacuum leak-fuel mix-fuel pressure-timing-pcv valve-egr valve-air filter-oil sludge build up-problem in heads[valves adjustment-burnt-weak springs if only changed wires do a complete tune-up and do a compression check

Mar 14, 2010 | 1991 Chevrolet Camaro

2 Answers

What do i needd toget for atune up itsrunning rough


1) New spark plugs (make sure the gap is correct, ask the person at the parts store to check the gap on all 4 new plugs for you).
2) New distibutor cap and rotor.
3) New spark plug wires.(replace them one at a time so you dont get the wires location crossed up).
4) New air filter.
5) New fuel filter.
6) One bottle of STP fuel treatment (red bottle)
You will need a 5/8" spark plug socket and extension to replace the plugs. Look at their condition when you pull each one of the old ones out.
Do this job in the shade with a cold engine.
Do not be in a hurry!
I hope this helps you and your Honda!

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1 Answer

96 old bravada multiple misfires


Check for bad spark plug wires or wires connected to the wrong cylinder.

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'95 Acura Integra~ Loss of power, lesser gas mileage, rough idle


my 96 integra is idling rough and bogs when i step on the gas i have replaced spark plugs,disb cap, rotor,wires,both o2 sensors,pcv valve and timing belt water pump replaced not long ago looked for vacuum leak can't find any. what could be the problem am i missing something

May 22, 2009 | 1994 Acura Integra

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When 87 suzuki stops it dies, hesitation when starting


I've never seen a samurai without a PCV valve hooked up. You sure its just missing it cuase that is what releases the pressure build up in the engine. If not working/installed then you're gonna get piston blow by, oil burning, and a rough running engine.

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2000 GMC Sierra 4.3L no spark at the plugs...HELP!


no codes. most direct components changed.
computer. take it out or have the truck towed to the shop/dealer to test the computer.

Sep 25, 2008 | 2000 GMC Sierra

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