Engine will not run

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the fuel pressure if its within specs-start here and get back with the readings
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Thursday, November 30th, 2017 AT 10:32 AM (Merged)
Tiny
MICON1
  • MEMBER
  • 3 POSTS
  • 1994 CHEVROLET TRUCK
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 83,237 MILES
Engine Performance problem
1994 Chevy Truck 6 cyl Two Wheel Drive Automatic 83237 miles

my truck wont stay idle for a long time unless ia give it gas. Why is it not idleing? And it wont crank on the first start. It a chevy 1994 c1500. Help!
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Thursday, November 30th, 2017 AT 10:32 AM (Merged)
Tiny
MHPAUTOS
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  • 31,937 POSTS
Hi there,


https://www.2carpros.com/forum/automotive_pictures/61395_Noname_24.jpg



Hi there do these checks thoroughly and see how you get on, re post if you still have a problem.

mark (mhpautos)
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Thursday, November 30th, 2017 AT 10:32 AM (Merged)
Tiny
MICON1
  • MEMBER
  • 3 POSTS
************i have a v6 engine. And it shuts off when I take my foot off the gas and put it into drive. Is it by anychance the distributor or spark plugs or is the fuel pump just weak? Im just askin because I dont want to waste my money. If u think its sometin else then just reply back please!
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
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Hi there,

I would be thinking more along the lines of the idle control motor, but I would not hurt to check fuel flow & pressure, if the plugs and leads are old check the plug gaps or replace them and test the leads for high resistance with a multi meter, but I would do the checks first posted if you have not bone so.

Mark (mhpautos)
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
MICON1
  • MEMBER
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******thanx I will try that, oh and thanx for helping me, I would donate but I dont have a card, how do u vote? And if I did vote then it would be a 5 out of 5 cuz at least ue helpin thanx so much for ur time. I'll check back wit u if it works
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Hi there,

If you wish to give feedback, just click on the blue link that says give feedback on my post.

Mark (mhpautos)
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
RICKK
  • MEMBER
  • 1 POST
  • 1994 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 90,000 MILES
Electrical problem
1994 Chevy Truck V8 Four Wheel Drive Automatic 90000 miles

Hello,
I have a Chev 1500 pickup with a recently replaced engine (good junk yard engine). Throttle body injection.
The engine fires and tries to start, but quits immediately.
This engine did run nicely for about 50 miles then died!

I don't know if the problem is electrical or gas. Engine won't keep running (acts same) when gas is poured in engine. I believe problem is electrical-all sensors etc. Were replaced.

I would like to test fuel pressure-can you tell me how before I try?
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
https://www.2carpros.com/car_repair_video/test_fuel_injection_pressure.htm
Go here and checkout our video.
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
HELPING YOU
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  • 100 POSTS
Ya that was real helpful huh? I like how they always tell you to "start the vehicle and let it idle" while you're trying to diag a crank/no start. I have an adapter somewhere that you put in place of the filter on chevys (Lisle or OTC?)- Then you attach guage to that - if memory serves me this is the easiest.
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Test ignition mod and coil: Here's how.
Ignition System 1. Disconnect tachometer wire at distributor tachometer terminal (if equipped). A shorted tachometer or tachometer circuit prevents vehicle from starting. Ensure TP sensor and coolant sensor codes are not present and sensors are not out of calibration. 2. Check for battery voltage at "+" terminal of ignition coil with ignition on. See Fig. 1 - Fig. 4 . Repair as necessary. 3. Connect Spark Tester (ST-125) to end of one plug wire. Crank engine. If spark is present, check fuel delivery. 4. If spark does not occur, disconnect 4-wire EST connector at distributor and check for spark at ignition coil tower using Spark Tester (ST-125). If spark now occurs, check cap and rotor for damage or wear. Check for open in coil wires. 5. If spark does not occur, reconnect EST connector. Leave spark tester connected to coil tower for remainder of test. Disconnect ignition coil Black 2-wire connector, and check voltage on "C" and "+" terminals with ignition on. 6. If voltage on both terminals is 10 volts or greater, go to next step. If voltage on both terminals is less than 10 volts, repair wire from "+" terminal on module to "B" terminal on coil Black 2-wire connector. If voltage is less than 10 volts on "C" terminal only, check for open or short to ground in circuit from "C" terminal of ignition module to ignition coil. If circuit is okay, problem is faulty coil or coil connections. 7. Connect voltmeter between ground and tachometer terminal at coil with ignition on. Tachometer terminal may be taped back against harness. If voltage is greater than 10 volts, go to step 9). 8. If voltage is 1-10 volts, replace ignition module and check for spark at coil tower using Spark Tester (ST-125). If voltage is less than one volt, repair open in tachometer lead or tachometer connector. After repairs, recheck voltage at tachometer terminal. 9. Connect test light between ground and tachometer terminal. Crank engine. If test light remains on (steady), go to next step. If test light flashes, replace ignition coil with a known-good unit and recheck for spark. If spark does not occur, reinstall original ignition coil and replace ignition module. 10. Remove distributor cap. Unplug ignition module pick-up coil connector. Connect voltmeter between ground and tachometer terminal. Turn ignition on. Using jumper wires, connect positive end of a known-good 1.5-volt battery to terminal "P" of module. Observe voltmeter at tachometer terminal as negative end of test battery is momentarily grounded to distributor housing. 11. If voltage at tachometer terminal does not drop, check ignition module ground. Check for open in wires from ignition coil to module. If all is okay, replace ignition module. 12. If voltage at tachometer terminal drops, check for spark at spark tester as jumper is removed from terminal "P". If spark does not occur, go to next step. If spark occurs, check pick-up coil connections. Check for 500-1500 ohms resistance at pick-up coil leads. Ensure leads are not shorted to ground. Repair as necessary. 13. Test ignition module with module tester. If module tests okay, check ignition coil wire. If module tester is not available, replace ignition coil, and touch terminal "P" again. If spark occurs, system is okay. If spark does not occur, reinstall original ignition coil, and check coil wire from distributor cap. If no problem is found, replace ignition module. Page 1 of 1 BASIC TESTING - GASOLINE -1994 Chevrolet Pickup K1500 3/6/2009


https://www.2carpros.com/forum/automotive_pictures/62217_k1500a_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_k1500b_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_k1500c_1.jpg



https://www.2carpros.com/forum/automotive_pictures/62217_k1500d_1.jpg

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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
EFRENMIGUEL
  • MEMBER
  • 2 POSTS
  • 1994 CHEVROLET TRUCK
  • V8
  • 4WD
  • AUTOMATIC
  • 256,000 MILES
Electrical problem
1994 Chevy Truck V8 Four Wheel Drive Automatic 256000 miles

when I turn the ignition on my truck to start the motor, nothing happens. The battery is good. It starts once in a while and then when I shut of the motor, it will not start again. The gages work but it seams like no electricty is getting the the starter. You can hear the fuel pump working. Could it be the ignition control module?
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum. I'd have to make sure the battery has a full charge and the positive and negative connections are good. If the starter won't crank, check the starter circuit, the purple wire at the starter solenoid should be hot with the key in the start position. Some of the national brand autostores will check the starter itself, you have to take it off and take it to them. I don't know if their test would catch an intermittent?
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
EFRENMIGUEL
  • MEMBER
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Thank you for the reply. I did check the battery and it is good. I will check the starter to see if I am getting 12 volts with the volt meter.
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 1994 CHEVROLET TRUCK
  • 225,000 MILES
Have replaced injector and housing fuel pump and filter yet it still will not start it acts like it wants to but noting getting fuel up to the injector for sure and I know it has spark. I can spray fuel into the intake and it will start right up, but just run for seconds till the fuel I sprayed in is gone. What else could it be since almost the entire fuel system has been replaced from tank to the injector? I'm at my wits end and have no real clue.
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
So can not see fuel spray fr4om injector? If yes suspect ignition module inside Dist at fault if ECM does not receive ESC signal will not fire injector
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
QWIKSTOP
  • MEMBER
  • 2 POSTS
  • 1994 CHEVROLET TRUCK
I went to go to the store the other day and started my blazer. It ran for a couple seconds then shut off after some rpm fluctuations. Now, it won't start again. I checked all of the electrical connections, but no fuses etc. It turns over, just won't run. It was running fine not even 3 hrs. Before that.
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
GARFIELD
  • MECHANIC
  • 197 POSTS
You may want to have check your ignition module and do a fuel pressure test.
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)
Tiny
QWIKSTOP
  • MEMBER
  • 2 POSTS
Hey, I appreciate the suggestions. After ensuring the fuel pump worked and the cpi had pressure, I figured it must have been electrical. I looked at the fuses, no problem, then pulled the distributor cap and saw the rotor tab was rusted. I scraped off all the rust and it fired right up. Runs great now! Thanks!
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Thursday, November 30th, 2017 AT 10:33 AM (Merged)

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