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Crank but no start: 2005 Chevy Impala 3.4


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gordon.mcglocklin
New User

Jan 24, 2022, 12:57 PM

Post #1 of 3 (339 views)
Crank but no start: 2005 Chevy Impala 3.4 Sign In

I have a 2005 Chevy Impala 3.4 I’m having trouble with, it will crank but won’t start. It was running when I drove it into my garage to complete some repairs. Listed is what all was done:

Replaced upper and lower Intake Manifold gaskets(did not loosen or torque down the rocker arm bolts, used push rod removal tool) also replaced all corresponding gaskets that had to be removed along the way.

Cleaned the upper and lower intake, throttle body, MAF, cleaned any and all debris from the opened block and coolant ports also.

Drained and replaced oil and filter.

Drained and replaced coolant.

Replaced Corresponding orings and injector orings

Bled the fuel lines.

Replaced MAP sensor

Replaced Camshaft position Sensor

Replaced one of the 2 crankshaft position sensors( the one on the back of the block by the firewall, have not replaced the one behind the harmonic balancer.

Replaced plugs and wires, verified firing order 10 times
1 / 3 / 5
2 / 4 / 6

Checked and replaced any blown fuses and relays

I am getting fuel pressure and getting fire, checked 4 times.

Cranks but will not start. It will backfire but won’t start.

Please help.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 24, 2022, 1:38 PM

Post #2 of 3 (335 views)
Re: Crank but no start: 2005 Chevy Impala 3.4 Sign In

Here's what you have to follow

All "crank, no start" conditions are approached in the same way. Every engine requires certain functions to be able to run. Some of these functions rely on specific components to work and some components are part of more than one function so it is important to see the whole picture to be able to conclude anything about what may have failed. Also, these functions can ONLY be tested during the failure. Any other time and they will simply test good because the problem isn't present at the moment.
If you approach this in any other way, you are merely guessing and that only serves to replace unnecessary parts and wastes money.



Every engine requires spark, fuel and compression to run. That's what we have to look for.

These are the basics that need to be tested and will give us the info required to isolate a cause.

1) Test for spark at the plug end of the wire using a spark tester. If none found, check for power supply on the + terminal of the coil with the key on.


2) Test for injector pulse using a small bulb called a noid light. If none found, check for power supply at one side of the injector with the key on.


3) Use a fuel pressure gauge to test for correct fuel pressure, also noticing if the pressure holds when key is shut off.

4) If all of these things check good, then you would need to do a complete compression test.

Once you have determined which of these functions has dropped out,
you will know which system is having the problem.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jan 25, 2022, 2:57 AM

Post #3 of 3 (302 views)
Re: Crank but no start: 2005 Chevy Impala 3.4 Sign In

Gordon,
So this was YOU drove this into garage expecting to do these repairs and now doesn't run at all yet cranks?

Got that I think. Now nothing after a list of work go back it ran now doesn't what or which messed up?

Silly stuff too like did it run out of gas wouldn't be the first time get caught by a basic,

T







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