I have replaced everything and still no fire/spark.

Tiny
TSZALAY63
  • MEMBER
  • 1995 CHEVROLET CORVETTE
  • 146,000 MILES
I have replaced every sensor, coil, distributor, plugs and wires, coil module, checked key, fuses. EVERY thing and still no spark, no fire, engine will turn over but no fire. I need help. What else is there?
Friday, December 16th, 2011 AT 8:26 PM

21 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the crankshaft position sensor
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Friday, December 16th, 2011 AT 8:41 PM
Tiny
TSZALAY63
  • MEMBER
  • 3 POSTS
It is a 1995 it does not have a crankshaft position sensor! I have replaced all sensors.
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Friday, December 16th, 2011 AT 9:32 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check and test the distributor pick-up coil
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Friday, December 16th, 2011 AT 9:37 PM
Tiny
TSZALAY63
  • MEMBER
  • 3 POSTS
I replaced the coil and all the wires! Where is the pick up coil
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-1
Friday, December 16th, 2011 AT 9:52 PM
Tiny
8PRG
  • MEMBER
  • 1 POST
  • 1985 CHEVROLET CORVETTE
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 147,000 MILES
My car listed above c4 Corvette it's cranking but not starting. It was having trouble running while operating. As in I was driving and the engine would stall out. Began to troubleshoot and saw that there was no fuel pressure so I replaced the fuel pump and fuel pump relay which restored fuel pressure temporarily however, I was losing fuel pressure intermittently while troubleshooting. Decided to replace the ignition module along the way when I found that there was no spark to the engine and couldn't even get the car to run on starting fluid. Needless to say the new ignition relay was able to the engine running for about 2 minutes and then she died again. I don't know what the problem is though I suspect a grounding issue now. I also think the new ignition relay burnt too. Can't be sure unless I replace it again and another on goes out.
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Thursday, June 18th, 2020 AT 9:41 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,362 POSTS
On these it best to replace the pick up coil and main ignition coil make sure you have the ground strap inside the coil housing or you can get a rebuilt distributor. Here are the instructions in the diagrams below to help you fix the problem:

Procedure
1. Disconnect ignition switch battery feed wire and tachometer lead (if equipped) from distributor cap. Also release the coil connectors from the cap. (Do not use a screwdriver or tool to release the locking tabs.)
2. Remove distributor cap by turning four latches counterclockwise. Move cap out of the way.
3. Disconnect 4 terminal ECM harness from distributor.
4. If necessary remove secondary wires from cap, release wiring harness latches and remove wiring harness retainer. The spark plug wire numbers are indicated on the retainer.
5. Remove distributor clamp screw and hold-down clamp.
6. Note position of rotor, then pull distributor up until rotor just stops turning counterclockwise and again note position of rotor.

To insure correct timing of the distributor, the distributor must be installed with the rotor correctly positioned as noted.
If the engine was accidentally cranked after the distributor was removed, the following procedure can be used for installing:

a. Remove No.1 spark plug.

B. Place finger over No. 1 spark plug hole and crank engine slowly until compression is felt.

C. Align timing mark on pulley to "0" on engine timing indicator.

D. Turn rotor to point between No. 1 and No. 8 spark plug towers on distributor cap on 5.0L engines, between No. 1 and No. 6 on 3.0L and 3.8L between No. 1 and No. 2 on 2.8L and between No. 1 and No. 3 on 1.8L, 2.0L and 2.5L engines.

E. Install distributor and connect ignition feed wire.

F. Install distributor cap and spark plug wires.

G. Check engine timing.

Use AC Delco parts for best results. Check out the diagrams (below). Please let us know what happens.
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Thursday, June 18th, 2020 AT 9:41 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,401 POSTS
Hi,

There was a technical service bulletin years ago that indicated problems with the ignition coil breaking down. Here is what it says:

" General Motors has determined certain 1984-1985 Chevrolet Camaro and Monte Carlo models with 5.0L V8 engine and 1984-1985 Chevrolet Corvette models with 5.7L V8 engine may exhibit declining ignition voltage of the high output ignition coil.

High ignition coil temperatures combined with the stress of higher voltage may break down the epoxy coating of the high output ignition coil secondary windings. Declining ignition voltage may lead to engine misfire, hesitation, sags, or no re-start. Correction will consist of replacing the high output ignition coil and module."

I have a feeling this is the issue. If there is no spark detected, the PCM will turn off the fuel pump.

__________________________________

Here are directions for testing the coil. I believe this has an integral coil in the distributor. If I'm wrong and it is in a remote location, let me know. The attached pics correlate with the directions. The directions also include checking the pick up coil.

_________________________________

1985 Chevrolet Corvette V8-350 5.7L
Units With Integral Coil
Vehicle Powertrain Management Ignition System Distributor Testing and Inspection Component Tests and General Diagnostics Units With Integral Coil
UNITS WITH INTEGRAL COIL
Fig. 15 Testing integral ignition coil

Pic 1

Ignition Coil Testing
1. Connect a suitable ohmmeter as shown in Fig. 1, step 1. Using the low scale, read ohmmeter. Should be near zero or zero. If not, replace coil.
2. Connect ohmmeter both ways as shown in Fig. 1, step 2. Using the high scale, read ohmmeter. If both readings are infinite, replace coil.

Fig. 16 Testing integral coil distributor pickup coil

Pic 2

Pickup Coil Testing
1. Remove distributor rotor, then disconnect pickup coil leads from module.
2. Connect ohmmeter as shown in Fig. 2, step 1. Connect a suitable vacuum source to vacuum advance chamber (if equipped) and note ohmmeter reading throughout entire vacuum advance range. If no vacuum advance is used, flex leads by hand to check for opens. Ohmmeter should read infinite at all times. If not, pickup coil is defective and must be replaced.
3. Connect ohmmeter as shown in Fig. 2, step 2. Repeat step 2. Ohmmeter should read one steady value between 500-1500 ohms. If not, pickup coil is defective and must be replaced.

Note: Ohmmeter may deflect if vacuum advance range causes timing core teeth to align. This is not to be considered a defect.

Fig. 14 Testing Hall Effect switch

Pic 3

Hall Effect Switch Testing (If Equipped)
1. Carefully noting polarity, connect battery and suitable voltmeter as shown in Fig. 3.
2. Voltmeter should read less than 0.5 volts. If not, replace Hall Effect switch.
3. Insert knife blade as shown in Fig. 3. Voltmeter should read within 0.5 volts of battery voltage. If not, replace Hall Effect switch.

________________________________

Let me know if this helps and what you find.

Take care,
Joe
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Thursday, June 18th, 2020 AT 9:41 AM (Merged)
Tiny
ENAIRE
  • MEMBER
  • 3 POSTS
  • CHEVROLET CORVETTE
1995 Corvette:
150,000 miles
350 LT1, Manual 6 speed.
Please could someone help. The car won't start. There are no sparks coming from any spark plug wires. I also checked for spark from the ignition coil. But around 11volts are present at the input of the ignition module when the ignition key is turned "on".
I have replaced both the ignition module and ignition coil with no help. The resistance of the ignition coil wire is around 3.3k ohm which is under the specified limit of 5Kohm. The ignition coil module ground circuit is good. The wire coming from the Ignition coil module to the PCM is good. The only thing that is left that I know of to replace is the PCM itself. A abd PCM maybe? And also what I have not satisfactorily done is retreive the trouble codes. It has a 16 pin diagnostic connector which is for OBD-11. But my OBD-11 code reader is only good for 1996 and above vehicles. I tried it anyway and it gave an "error" when I pressed the "read" button.
Sorry it turned out to be a two parts question. How do I retrieve the codes without a reader. I'm hoping any of the codes will tell me why it is not starting.

Thanks in advance.
Enaire
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Find/Inspect/Test the crankshaft position sensor-also the voltage reference on the connector.

Resistance check close to 1kohms -its okay.
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
ENAIRE
  • MEMBER
  • 3 POSTS
1995 corvette

Hi rasmataz,

Thanks for a quick reply. I did what you said. I ohmed the position sensor and it is okay, but I replaced it anyway and I'm still getting no spark. Any other suggestion?

Thanks,
Enaire :cry:
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You have replaced coil/ICM/CPS dunno if it has a camshaft sensor-if it does check that too, if not could be coming from the computer

BTW did you check for the ref. Voltage at the connector on the CPS
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
GWH
  • MEMBER
  • 14 POSTS
Did you replace the Opti-spark unit?

GWH
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
ENAIRE
  • MEMBER
  • 3 POSTS
Did you replace the Opti-spark unit?

GWH[/quote:4021aa9aa3]

I will try a new Opti-spark unit.

Thanks
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
TOM530
  • MEMBER
  • 2 POSTS
  • 1992 CHEVROLET CORVETTE
  • 2,000 MILES
I have no spark? Win the car is clod it runs just fine win it Warms up pancarditis and will not start ! I put a new Optix spark Distributor and new ignition control module ! Some one say it my be a bad or going out Ignition knock sensor? What do you think it my be? I Put the new coil on it?
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Have checked for codes? What is "pancarditis"? Has fuel pressure been checked?
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
TOM530
  • MEMBER
  • 2 POSTS
There's no codes and yes there Feel pressure? Just no spark after it Warms up and just dies like win u trun the car off and then you try starting if will not start win tell its Cools off a couple hours but this time it will not start? Any Any ideas how about the Knock sensor? Wood that make it not run

I have the lt-1 motor in my 1992 vette?
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
MADMIKE1735
  • MECHANIC
  • 951 POSTS
The knock sensor wont give you a no spark condition. It simply advances, or retards timing when it senses engine knock. What engine is in this car, the LS1 I believe right? If so, your distributor sits behind the waterpump, kinda sucks to change.
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
MADMIKE1735
  • MECHANIC
  • 951 POSTS
Just wondering if you have solved this issue yet?
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
WALTC69
  • MEMBER
  • 2 POSTS
  • 1969 CHEVROLET CORVETTE
  • V8
  • 2WD
  • AUTOMATIC
  • 65,000 MILES
I purchased a new mallory v8 billet dist. W/tach. Drive #7564501. The dist. Was installed by a Corvette dealer in Houston and was working fine when I took possesion of the car. I have only started the car 4-5 times since the dist. Was installed. Recently the engine started to die at idle and would not start again unless I waited a minute or two. After a few times of doing this the car would not start at all. The carb. Is getting fuel. The battery is fully charged. The dist. Is getting full voltage when cranking. I confirmed this by running a jumper cable directly from the battery to the battery term. On the dist. I am not getting spark at the spark plug or the distributer. Any ideas?
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Maybe faulty ignition module
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Thursday, June 18th, 2020 AT 9:42 AM (Merged)

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