Help! Will not start, but turns over

[cheftl13]

Ok, so please give me an explanation. The car started and ran beautiful 3 days ago!! Went to take it for ride, turns over, but will not start> WTF!! Any easy suggestions. Battery full charged, full tank of gas. Have not touched anything. Trying to avoid getting it towed to the garage.ad

Notes: just replaced the oil pump sending unit. Car started immediately after install.

 

[Mac]

Insufficient information to provide meaningful diagnosis. Start with the basics... good troubleshooting will always start with the basics.

Is the engine getting fuel? When the engine is turning over, is there spark at the plugs? If yes to both, time for a compression test, etc etc...

-Mac

 

[cheftl13]

Insufficient information to provide meaningful diagnosis. Start with the basics... good troubleshooting will always start with the basics.

Is the engine getting fuel? When the engine is turning over, is there spark at the plugs? If yes to both, time for a compression test, etc etc...

-Mac

fuel is jetting into the carb,, i will chk for spark tonight.

 

[bill81vette]

Double Check to make sure all your connections are tight..perhaps something on the starters connection is loose

 

[Mac]

fuel is jetting into the carb,, i will chk for spark tonight.

If it's a single carb, then it's not the factory "Cross-Fire Injection" system, I take it?

-Mac

 

[cheftl13]

If it's a single carb, then it's not the factory "Cross-Fire Injection" system, I take it?

-Mac

Mac, you are correct, it has a quadr-jet. I figured it out. A wire going into the coil came disconnected. Now, while I have your attention. If I race the rpm's in neutral, it back fires slightly on the decelaration. When in gear, it back fires slightly when switching gears from 2 to 3rd. Any thoughts??

 

[bill81vette]

Check your timing ....
How many miles on the engine????

 

[cheftl13]

Check your timing ....
How many miles on the engine????

Bill, it only has 58200 on it! I just took it for a rip and wow, ran great. the oil pressure never passed 55 psi with the pedal to the metal! It seems like it only "pops/lightly backfires" when the engine is cold. Again, its more of a "pop/puff" from the exhaust, than a backfire.

 

[Mac]

Bill, it only has 58200 on it! I just took it for a rip and wow, ran great. the oil pressure never passed 55 psi with the pedal to the metal! It seems like it only "pops/lightly backfires" when the engine is cold. Again, its more of a "pop/puff" from the exhaust, than a backfire.

Yup, check your timing and the condition of your spark plugs.

-Mac

 

[JohnZ]

When the vacuum diaphragm in the A.I..R. diverter valve fails, the valve defaults to open, and it'll "pop" on deceleration, plus causing a vacuum leak. Could also be an air leak in the exhaust system.