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I HAVE NO INJECTION PULSE ON A 1987 CHEV S10 PICK UP WITH A 2.5 LTR WE HAVE REPLACED THE COMPUTER CHECK ALL FUSES AND THE MODULE IGN.

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Can you hear the fuel pump in the tank working as you turn the key to on not run position ?

Posted on Sep 09, 2009

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Does an ignition control module have anything to do with fuel pump functioning?


1987 rangers use a device called a TFI module to control ign. timing , this merely triggers a std. coil to fire the center port of distributor cap , this device only controls the coil to fire but does send a pulse for timing back to ecu this sets the base pulse for fuel injection , but its also affected by manifold Air flow and exhaust O2 amounts (closed loop) , but engine should run in base mode (open loop) fuel timing (but not well) , fuel pump relay is enabled to run via ECU output , Now your year ranger had a tech bulletin out on fuel pumps , seems they had a problem getting them to work after a fuel filter was replaced , something about a false backpressure , no if you have no/low fuel pressure then id look at fuel pump power 1st then fuel pump itself assuming you've already tried a new filter of course

Jun 14, 2015 | 1987 Ford Ranger

2 Answers

I have a 1987 chevy S10 4x4 xcab pickup . it just died one day i rebiult the TBI and put a new computer in it and new coil in . Have checked all the fuses . and it will not start .do you know what i


Check if you have spark (coil or ignition problem) Next consider what you did when rebuilding the TBI as there may be parts that will only operate in one way or settings that have to be adjusted. Lastly is the new ECM compatible with the system (immobiliser) Use a scanner to reset the ecm program

Nov 22, 2014 | 1987 Chevrolet S-10 Pickup

1 Answer

Car cranks but will not start


This could go several ways #1 engine mechanical check cranking compression should have 125 psi or greater in all cylinders if low but even squirt oil (1/2 oz.) in 1 cylinder and retest goes higher then rings sealing has been lost. if uneven check timing belt for jumped or misalignment. #2 electrical does it have electrical spark to plugs crank engine with a spark plug connected to spark plug wire laying plug on engine can you see spark? No test ignition coil wires with a logic probe both terminals will be red with key on one will flash red/green when engine cranking does not the primary ignition needs repair Ignition module? or pick-up coil/ crank sensor. #3 fuel system pressure and injection pulse. injection pulse can be tested with logic probe DONOT USE A TEST LIGHT YOU CAN RUIN THE ECU .

Mar 21, 2014 | 1998 Mazda 626

1 Answer

1987 cutlass ciera TBI carb -fuel to carb but no fuel injecting into carb-jet module is good-What other problem


If there is fuel to the fuel injectors in the top of the throttle body TBI (Throttle Body Injection) but they do not function, then most likely there is no signal or pulse to the fuel injectors. Check the ECM and the Fuel Injection fuses first.

The ignition module and the pick-up coil/stator located inside of the distributor is what generates the signal that the ECM (Engine Control Module) uses to time and fire the fuel injectors, as well as the signal to run the fuel pump and the dwell signal timing to fire the ignition coil, and a faulty ignition module can cause any one of these systems or all of them to malfunction.

That does sound like a malfunction with the ignition module inside of the distributor, and you can remove the ignition module and have it tested for free at most auto part stores. If the ignition module does test out alright then the problem could still be in the pick-up coil/stator, (it can be tested using an ohm meter by dis-connecting the wire connector from the pick-up coil/stator and the ohm reading between the two wires from the pick-up coil/stator should be between 500 and 1500 ohm's, and both of the wires from the pick-up coil/stator should show an open loop or an infinite reading between each wire and ground) and if the pick-up coil/stator is found to be faulty then replace the entire distributor, or the distributor will have to be dis-assembled to install a new pick-up coil/stator.

If you do purchase a new ignition module be sure that it does come with a silicone grease or a die-electric compound because it is a heat sink and the ignition module will burn up without it.

To install the new ignition module first clean out the mounting surface inside of the distributor. Then completely coat the metal contact surface under the ignition module with a thick coat the silicone grease or die-electric compound and do not leave any of the metal contact surface of the ignition module un-coated with the silicone grease or die-electric compound, and be very careful not to over-tighten the ignition module or it will be damaged.

Aug 13, 2010 | 1987 Oldsmobile Cutlass Supreme

1 Answer

Hi, i have a LS1 Chev and the 4 rear Cyls wont fire, have replaced Plugs , leads and the coil packs seem to be ok, can you help?


use a12 volt test light and test for power on pink and black wire to the coils if no power check ign fuses manly ign 1 fuse if you have power then hook test light to bat positive and check for grounding pulse on the other wire at each coil if it is pulseing while cranking then suspect bad coils.

Aug 11, 2010 | Chevrolet Corvette Cars & Trucks

2 Answers

89 s10 2.5 has fuel and fire injector has power but no pulse


injector pulse is just controlled by the ecm or computer as some would say,u said u replaced wires? did u have a fire or melt wires? ecm is known to go bad on these,had a few of these trucks back in the day.

Feb 16, 2009 | 2000 Chevrolet S-10

2 Answers

Changing wiper motor in chev s10


It's not bad. They make a special tool to remove the motor from the arm assembly, but with a little determination I was able to remove it with out the tool. If your wipers aren't working try running power to the motor first to test it. I swapped it out and the problem ended up being a bad ground in the switch. I bypassed that for a little while by running a jumper wire from the engine block to motor. It also could be the pulse module they are known for going bad in GM vehicles.

Jan 18, 2009 | 1998 Chevrolet S-10 Pickup

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