Engine not starting?

Tiny
DANG DANGULSON
  • MEMBER
  • 2000 JEEP GRAND CHEROKEE
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 320,000 MILES
I replaced all of my injectors. I am getting fuel to the rail with pretty good psi. However, it just cranks no start. I tested all of the injectors also before I installed all were good. However, I also noticed that I now have a warning light in the upper right hand corner of a key with a line through it. Is it a security issue or ECM problem?
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Monday, January 1st, 2018 AT 6:56 AM

36 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,554 POSTS
What does the light look like? can you upload a picture or video of it so we can see what it is? When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.
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Tuesday, January 2nd, 2018 AT 11:18 AM
Tiny
MRSWILLIAMS102983
  • MEMBER
  • 1 POST
  • 2000 JEEP GRAND CHEROKEE
  • 6 CYL
  • 176,000 MILES
My 2000 jeep starts when it wants to and the check engine light is on. I can drive it short distances and it will start but not long distances because once I cut it off it won't start for hours. Had starter checked and it was fine. Nothing shows on the parts shops computer except "no codes found". S O S. -Marquita
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Sunday, August 30th, 2020 AT 10:46 AM (Merged)
Tiny
CARADIODOC
  • MECHANIC
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"Won't start for hours" can mean a lot of things. Since you had the starter checked, does that mean it won't crank the engine? Or do you mean the engine cranks fine but it won't start and run?

If you hear just one single kind of loud clunk from under the hood and the engine doesn't spin, that is due to worn starter solenoid contacts. They can be replaced separately but most people just replace the entire starter. This problem always starts out as an intermittent problem. The starter will work if you cycle the ignition switch to "crank" enough times.

Caradiodoc
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Sunday, August 30th, 2020 AT 10:46 AM (Merged)
Tiny
CJ MEDEVAC
  • MECHANIC
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Doc, Reckon this could be needin' shimmin',

You know I'm stuck way back in the '40s-'80s with my Real Jeeps,

I know little of the new stuffs starters,

Thought maybe a Good and Warmed up Flywheel might "Grow" and take up some Starter Clearance. If maybe the starter kinda "Wedged In" during an attempted start.

Saw recent post of yours Doc, Never seen you get carried away on the keyboard as I do. Imma Plumber too, Best Plumbing Service Technician, this side of the Mississippi! Still no job after Bone Doctor released me to Work, had broken foot w/ complications, broke it 19 Dec 08 at work. Go for final check, Monday, get some sort of Workers Comp disability assessment, 'if' he completely turns me loose. Said I could go back to work in August. Employer said ain't enough work, others are 'skeeerd' to hire me. My 1st experience touching the Cyber Box, was while laid up, when I asked a question here.

The Medic
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Sunday, August 30th, 2020 AT 10:46 AM (Merged)
Tiny
CARADIODOC
  • MECHANIC
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Not happy to say I'm becoming a plumber. Today I'm fixing busted pipes in my hydronic heating system and trying to add a port to fill it with antifreeze. I hate winter!
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Sunday, August 30th, 2020 AT 10:46 AM (Merged)
Tiny
DONRYAN
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  • 1 POST
  • 2000 JEEP GRAND CHEROKEE
  • 200,000 MILES
Hooked jumper cables up backwards now wont start.
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Sunday, August 30th, 2020 AT 10:46 AM (Merged)
Tiny
CARADIODOC
  • MECHANIC
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Please add some details. "Won't start" can mean multiple things. Does the starter crank the engine, but the engine doesn't run? The starter fails to crank the engine? Have you checked the fuses? There are going to be multiple blown fuses, both under the hood and inside. Do any other systems work or not work, such as head lights, radio, heater fan, etc?

Why was the jump-start initially needed? Was this a one-time thing, such as the head lights were left on, or have you been dealing with a weak battery for some time? Any other symptoms related to this problem?

Please list the engine size in case I need to search for electrical diagrams. Many electrical circuits are different depending on the engine that was used. Have you done any testing so far, and if so, what were the results?
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Sunday, August 30th, 2020 AT 10:46 AM (Merged)
Tiny
DALAN
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  • 2 POSTS
  • 2000 JEEP GRAND CHEROKEE
  • 157,000 MILES
Started out with brake lights wouldn't turn off. Had to recharge battery. Needed to clean turminals (used baking soada and water). Accidently crossed battery cables now jeep wont start. Checked fuses didn't find any blown.
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Sunday, August 30th, 2020 AT 10:46 AM (Merged)
Tiny
ASEMASTER6371
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Check fuses with a test light. There is a large main fuse that should have blown shutting off the whole car of power. After replacing that, re-check all fuses with test light to verify power. Keep your fingers crossed that no other modules burned out from crossing the cables.

Roy
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Sunday, August 30th, 2020 AT 10:46 AM (Merged)
Tiny
BRIAN K SWOPE
  • MEMBER
  • 3 POSTS
  • 2000 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
I came out to my car and turned the key only to find no power on dash. Turns over but will not start. Checked the main fuse box and no power to transmission solenoid, starter and 02 sensor from the seat. Fuses are fine. Checked the inside fuse panel and half of those have no power.
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
HMAC300
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Check the ASD relay as it may be bad try switching with a like relay see if that helps. Also try resetting security system if no owners manual look online for your car on how to do it. Finally if all fails have it checked for a possible bad fuse block under hood.
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
BRIAN K SWOPE
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  • 3 POSTS
I checked the asd relay with a relay checker and that was fine. I didn't know it had a security system. I get head lights and interior lights. No door locks or windows either. Then while unplugging and plugging it back ECM I had door locks. Some say negative battery cable. I have a voltage meter coming and I am going to run a few checks on that. How would I know if it's the fuse block is bad?
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
HMAC300
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It may be just not sending power to fuses check with key on at fuses and see what you have with a volt meter like remove the fuse and stick prong of volt meter in it if it doesn't work with key on on one then i'd say that may be your problem. Make sure to check all fusible links and ignition switch as well as it may be an ignition switch.
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
BRIAN K SWOPE
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Ok. Will get back to you with results asap. Thnx.
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,554 POSTS
Please let us know what you find so it will help others.

Best, Ken
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
JAMESODOM
  • MEMBER
  • 10 POSTS
  • 2000 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 210,000 MILES
1. Towed to shop due to Crank no Start condition
2. ODB Computer (Autel DS708) Showed NO Code.
3. Vehicle will crank over and sometimes will start and run really rough then die.
4. Most times it will not run at all. It blows compression back through the throttle body
5. It will back fire sometimes.
6. The crank sensor tested good
7. CAM Sensor tested good
8. Map Sensor test good
9. Coolant Sensor Test Good
10. Fire on coil is good
11. Injector pulse is good
12. Fuel pressure is good
13. Checked Timing on the Balancer and it showed good. Removed the Timing cover and checked the chain and it showed good
14. I came to the conclusion that the computer was bad.
A. I ordered a used one from the salvage yard and had it programed
15. I replaced the computer and it did crank and run but had a Miss to the engine
16. ODB Codes showed Coil Misfire problems
17. Tested the Coil and it tested good, Rechecked all sensors again and tested good
18. Figured that the computer from the salvage yard was bad or something
19. Ordered a NEW Reman Computer from All Computer Resources in Miami Florida
a. I have purchase several jeep computers from this company over the years and been very pleased with this company
20. The new computer arrived
a. Computer installed
b. NEW CAM Sensor Installed
c. NEW Crank Sensor Installed
d. NEW Map Sensor installed
e. New Coolant Sensor Installed
f. NEW Plugs installed
g. New Coil Pack Installed
21. Vehicle will crank over but not start still.
A. Looks to be over fueling
b. Bucks really bad like the timing is not correct
c. Pops and backfires out the intake
d. Will not run
22. Put the computer from the salvage yard back in the vehicle and it will run sometimes but really rough like it is not firing on all cylinders. I did get it to run long enough that the exhaust pipe between the catalytic convert and the muffler was glowing red. ( Less than 5min)
a. I am guessing that this was from all the fuel that is dumped into the exhaust system from not starting.

I am now at a LOSS on this vehicle
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You need to look at some of these tests a little closer. What was the fuel pressure. Does the pressure hold within 5PSI for 15 minutes after shutting the key off?

When you put the scanner on it, look at data and see if the intake air temp sensor and the coolant temp sensor match before the truck is started.

What do the plugs look like when removed? Are the plugs fuel stained?
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
JAMESODOM
  • MEMBER
  • 10 POSTS
The fuel Pressure was at 52psi and no it did not drop any while cranking or after it was shut down. It will hold the pressure for hours.

I will have to check the temp and air sensor when I am back in the shop

The plugs were new but now are black soot looking now. They do smell of fuel though.
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
JAMESODOM
  • MEMBER
  • 10 POSTS
There was 2 degrees between the 2 sensors. One was 82 and one was 84
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
One more thing to check. Does the fuel pressure drop if the key is left on.

We have pretty much eliminated all sources of extra fuel. We need to check the compression.
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Sunday, August 30th, 2020 AT 10:47 AM (Merged)

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