Engine cranks, but will not start - GM Forum - Buick, Cadillac, Olds, GMC & Pontiac chat

Trouble shooting + Test Procedures Need to trouble shoot whats wrong and need to know the best way to test for it? Here it is.

Engine cranks, but will not start

 

 
 
 
Old 12-27-2010, 06:16 PM
  #1  
Retired Senior Admin

Expert Gearhead
Thread Starter
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 20 Times in 16 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default Engine cranks, but will not start

Scan the car for any DTC codes, even if no light is on. Check on any sensors mentioned on the DTCs

These are basic tests, you will need to check your cars FSM or repair manual to locate the correct wires and pins for testing, each car year and make is different.

1) test TPS, if this is over 80% injectors will not fire

2) Check MAP sensor

3) Check for spark, If you have no spark.
Test coils, check ICM plug and ICM

4) Check fuel pressure, 48-55 PSI
If low replace filter, fuel pump may also be going bad

5) Check fuel pump and ignition fuse

6) Unplug cam sensor and start, if engine starts, replace cam sensor

7) Listen to fuel injectors, do you hear them click?
Any not clicking. test wires between injector and PCM

8 ) Inspect all spark plugs

9) Inspect and test spark plug wires

10) Unplug the crank position sensor and probe the CKP sync signal circuit with a test light to B+ If light is off, replace crank sensor.

11) Test crank sensor with DVOM between 18x signal circuit at ICM and B+, crank engine, voltage should be between 5v-7v If over 7v, unplug crank sensor, test between same wires with test light, if light is on, locate short.

12) Replace PCM
Danthurs is offline  
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
elmerfud
1992-1999
21
09-11-2010 10:58 AM
karbear
2000-2005
2
03-24-2009 11:49 PM
olds9298
1992-1999
4
10-07-2007 10:27 PM
showshocka2k
1992-1999
11
03-14-2007 05:22 PM
mnalep
1992-1999
6
01-03-2006 09:27 AM


Thread Tools
Search this Thread
Quick Reply: Engine cranks, but will not start


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.