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The most common reason is that the alignment of the timing belt is incorrect. Verify this by setting Top Dead Center and checking that the valve, balance shaft and oil pump marks are correct. If the engine assembler took any short-cuts, the alignment marks can be WAY off, and the engine will not start.
Assuming the alignment marks are correct, verify that the plug leads are on the right plugs.
It is possible the belt is not correctly tensioned or perhaps the belt is in poor condition.
Sometimes pulleys can move along a shaft a little so they are not correctly aligned. Checking pulley alignment with a straight edge is an important part of fault-finding and maintenance of vee belt and pulley systems. Once the alignment is found to be correct a belt of the correct type is fitted and correctly tensioned the troubles should be at an end.
If they did the alignment correctly, you should be perfect. Now, on the other hand...any shop doing an alignment on a vehicle should be required to check all the suspension parts for damage and wear. Even a slightly loose ball joint or bushing needs to be replaced before such an alignment is done. Shops are notorious for shabby work nowadays and it is so hard to find a decent mechanic to do a job correctly. If your not happy with the job, bring it back and ask why it is doing this to the tires. I know it has been a while since you had the alignment down, but that is besides the point. Maybe the alignment guy was off that day and some other guy pretended he was an alignment guy, lol. When I get mine done, I love to sit in the window and watch them so called professionals do the work. They should give you a paper readout of the settings found and change to. But, most of all they should always check for worn parts that are almost always present. After and alignment, the mechanic better take it for a test drive. If that vehicle does not go straight down the road with hands off the wheel, it was not done correctly, period.
TRANSMISSION FLYWHEEL HAS TO ALIGN CORRECTLY.MAKE SURE FLYWHEEL IS IN THE ALIGNMENT DOWEL BOLTS TIGHTEN IN SEQUENCE IF NOT FLYWHEEL THATS NOT ALIGN CORRECTLY WHEN YOU TIGHTEN IT UP IN A BIND FLYWHEEL WILL CRACK.MAKE SURE FLYWHEEL TORQUE IS 59 FT LBS FOR THE 4.0 ENGINE.THE 5.0 ENGINE FLYWHEEL BOLTS TORQUE IS 75 - 85 FT LBS.IF OVER TIGHTEN FLYWHEEL IT WILL CRACK IT.
That's a problem called "toe in" and to properly have it corrected, it needs to go to an alignment shop. You would be able to adjust it (it's adjusted by loosening and resetting certain bolts) but without the alignment rack you won't get it set correctly and could make your car's handling dangerous.
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