Question about Buick Roadmaster

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92 Roadmaster 5.7 liter. Replaced distributor cap, rotor and eletronic control unit, plugs and wires, coil, fuel pump and line filter. There is spark at the plugs but the engine will not fire. Disconnected catalytic converter still won't start. Fuel injectors seem to be spraying adequate amount of fuel into carb. Crank engine for a 30 - 40 seconds and it won't fire.

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  • tcmaricle Apr 27, 2009

    Change the Throttle Position Sensor. Located on the throttle body. 2 screws and 1 electrical plug. About $25. This solved the problem for me.

  • Roosevelt James Jan 27, 2010

    Dist. goes bad alot and Seems like the timing chain is bad

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6 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: no fire

check the key swtich or just have it replaced

Posted on Oct 01, 2008

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emissionwiz
  • 76630 Answers

SOURCE: Fuel injectors or Distributor Cap?

the blinking CEL light is an indication of a miss-fire, run the code retrival test to find out what cylinder is the one missing, at your miles it could be almost anything from a low compression issue to a bad distributor cap, a fuel injector could be the problem, run the test and get back to me, Kragen and other chain parts stores will test the system for codes for FREE!

Posted on Nov 06, 2008

  • 3 Answers

SOURCE: engine cranks ,but no spark.

ain t many more parts to electrical system left... i had same problem once n it was my ignition modulator.located under distributer.**** i can t remember,i think my car would not turn overfrom that.or only other thing could be a fuse.i 'd check every fuse too .hope this might help.

Posted on Mar 12, 2009

  • 53 Answers

SOURCE: 92 mpv 3 liter loses injector pulse at @ 2000rpm

what it seems to me if your losing injector pulse is
-crank sensor
- or communication BUS between the ECU/PCM

-why crank sensor because it gives a signal for when that tells the PCM when
it should send fuel

-BUS communication because if its not getting a good signal then it doesn't know where
the crank is in position to the camshaft

Posted on Mar 28, 2009

  • 306 Answers

SOURCE: truck has no spark changed fuel pump fuel filter

Odds are it is the $20.00 ignition control module but that may be another fluke change out of parts. LOL

Posted on May 01, 2009

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1 Answer

Have 99 suburban 5.7. Just had fuel pump,filter,distributor,cap and rotor, spark plugs and wires, control module and coil replaced a little over a year ago. Drove great until it just shut off recently...


You might check for a fuel shut off valve. Some vehicles have them in case of an accident, it turns off the fuel pump. Some are just a relay that can be reset.

Jul 13, 2014 | Cars & Trucks

2 Answers

94 chevy 1500 4.3 no spark no fuel


Sounds like you replaced alot of parts for nothing.
The pickup coil in the distributor "fires" the module which grounds the coil and the injectors.
Those components would need to be tested. The coil fires the plugs when the ground is removed by the module or the key switch.

Jan 08, 2013 | GMC C1500 Cars & Trucks

1 Answer

Engine swings but does not start


Your testing so far seems to exonerate components #1 to #5, and #13.
Since you've already replaced a number of parts to address the problem, I thought I should try to be comprehensive:

Priority Action Part Type Cause
1 Inspect Ignition Switch - Improperly Connected or Faulty Ignition Switch.
2 Inspect Battery - Battery Discharged or Faulty.
3 Inspect Battery Cable - Coroded, Broken, Shorted or Poorly Connected Battery Cable.
4 Inspect Starter Solenoid - Starter Solenoid Faulty.
5 Inspect Starter Motor - Starter Motor Faulty.
6 Inspect Wireset - Worn or Damaged Spark Plug Wires.
7 Inspect Ignition Coil - Faulty Ignition Coil.
8 Inspect Distributor Cap - Loose, Cracked or Worn Distributor Cap.
9 Inspect Spark Plug - Incorrectly Gapped or Fouled Spark Plug(s).
10 Inspect Distributor Cap and Rotor Kit - Loose, Cracked or Worn Distributor Cap, or burned rotor contacts.
11 Inspect Fuel Tank - Fuel Tank Empty.
12 Inspect Carburetor - Worn, Faulty or Damaged Carburetor.
13 Inspect Fuel Pump - Faulty Fuel Pump.
14 Inspect Fuel Pump Strainer - Fuel Pump Strainer Clogged.
15 Inspect Fuel Filter - Fuel Filter Clogged.
16 Inspect Air Filter - Air Filter Clogged.
17 Inspect Fuel Injectors - Fuel Injectors Clogged/Inoperative
18 Inspect/Test PCM - Powertrain Control Module (Computer) defective - sending incorrect ignition/timing signals to fuel injectors
19 Inspect Fuel Rail - Fuel Rail leaking/broken causing inadequate/low fuel pressure.

Use a HEI (High Energy Ignition) tester to see if you have spark to your sprak plugs - if not, suspect Ignition Coil, Distributor Cap, or Distributor Rotor.

Nov 21, 2011 | Cars & Trucks

1 Answer

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

1 Answer

No fire


check the key swtich or just have it replaced

Jul 04, 2008 | 1992 Chevrolet C1500

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