Wont Start
Asked by Ryan Jul 22, 2018 at 05:12 PM about the 2007 Chevrolet Tahoe LT 4WD
Question type: Maintenance & Repair
I have a 2007 Chevy Tahoe LT, approx 200k miles.
Here is the story. My girlfriend was driving down highway, she heard a noise
like she ran over something and had a flat tire, immediately pulled over to
the side of the road at the same time Traction Control and Stabilitrack turned
off and the check engine light came on.
When she tried to start the car back up, nothing happened.
I arrived and checked engine codes before towed, came up CYLINDER #1
misfire. Plug, wire and coil are ok no breaks no burns.
Towed home.
Attempted to start, and you can hear the started want to engage, but you
either just hear the spin or a click. I took a breaker bar and turned crank
shaft while transmission is in neutral, it turns so I don't think the block is
seized. Checked all the hoses and vacuums, spark plugs and boots and
coils seem fine.
I erased codes and still nothing, no new codes either. Help would be great!
Also nothing wrong with fluids, oil clean and normal viscosity, coolant
DEXCOOL ok, muffler bearings and carb belts good to go too. Topped off
blinker fluids.
5.3L V8 4WD
12 Answers
Make sure the battery has a full charge and battery connections all good, at both ends, not just at the battery. Does the starter motor crank the engine or not? By reading your post, I'm not sure? If it cranks good but won't start, have a helper crank it while you check for spark at the plugs. Also, use a gage and check proper fuel pressure and fuel injector pulse. If you have serpentine belt, it's still there? Not carb belt. If you have distributor does the rotor turn when you crank it? I enjoyed the last paragraph in your post. lol
So far Battery was charged, but might have a bad cell so I am going to replace anyways. All wires seemed to have had a good connection. All you can hear is the starter try to turn but it is not cranking the engine. Serpentine belt intact. When I placed in Neutral I spun the crankshaft to check if engine seized and so far it turns I dont hear any knocking or odd sounds. Fuel pressure checks ok in the proper ranges I saw online.
BUt over all the started is not engaging the flywheel but never had a problem or struggle starting
It appears you have coil on plug or near plug ignition, so no distributor. You may need to check cylinder compression and timing chain?
yeah Im hoping its something simple. Im going to try to pull the started and have them bench test it to see if solenoid is bad. but it doesnt sound sluggish or anything
yes I have a coil on the top of the valve cover with a boot to coil on the spark plug
If you think starter motor problem, sometimes, you can take starter motor off, lay it on the ground, hook up jumper cables properly from charged battery to starter motor. It should kick out the drive gear and spin. You can check the teeth on flywheel and starter motor drive gear?
UPDATE: So recharged the battery, turned ignitiion, starter engaged and spun the flywheel & crankshaft. Pumped the gas pedal. nothing. as engine is turning I do not hear anything slapping like a timing chain or something. So now checking to see if I get spark or fuel
checked the pressure at the fuel rail on the top of the block. getting fuel. so perhaps no spark. im taking the battery right now to get it bench tested, although 12v is reading maybe a cell is bad not giving it enough cranking amps
UPDATE, so I ordered the Harmonic Balancer puller and removed. Opened up the timing chain cover and OOPS found the problem. The plastic guide for the tensioner and a few teeth on the upper sprocket (cam shaft sprocket) broke off. Now I am having the following problems and perhaps you know a technique since I have tried viewing YouTube videos, but people skip this step or they just talk too much about something other than the issue the video is on. So the oil pump on the crankshaft sprocket, is connected to the oil tube to the bottom of pan. Is there a way to remove the oil pump without removing the entire oil pan? Also from looking at the specs and such, I have used a wrench and turned the top sprocket over and over and over again and the position tabs (the dots) on the cam sprocket and crank sprocket never align, which leads me to believe that the chain has jumped the sprocket (although still attached) so of course once I replace the sprockets, chain, guides and all I would assume I have to manually align the sprockets to function properly, or is there another step Im missing?
Yes the chain has jumped over the sprocket ( that’s why teeth are broke off ) . Need to replace everything and yes the dots on sprockets have to match up if your not sure about the dots have someone who is look at it before you put the cover back on and you can line them up , then put everything else back and fire that mother up.