I have a 1990 beretta 3.1 V6 changed the timing chain on it dont start went back out to try and it back fired i now the timing is off but lined the dots evenly does the #1 cylinder have to be to the top or is it 2 to 1 ratio
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you must of not put the chain on right. to set it right you must have the number one pistion at the top of cylinder on compression stroke. then line up your timeing marks on the cam shaft then put on the chain.
Do you have the 2.2 liter Ecotec 4-cylinder engine, the 3.5 liter V6, or the 3.9 liter V6 engine? If you have the 2.2 liter engine, there may be a camshaft/timing chain issue if you skipped a tooth when you put the chain back on the cams. If it's a 3.5 or a 3.9 liter V6, you may have incorrectly installed the push rods back into the engine. 3.5 liter intake push rods are approx 5 3/4" long, while the exhaust push rods are approx 6" long. The 3.9 liter intake push rods are approx 5.81" long, while the exhaust push rods are approx 6.1" long. If you mix the two lengths up when you put them back in the engine, you're going to have problems.
The cranking will usually sound different after the timing chain has slipped. Does it spit or backfire when you crank it? I suggest you rule out some easier things before going after the timing chain. If you are getting spark and fuel, then maybe I would take a peek at the timing chain to see if it has skipped on the sprocket.
For the 3.3L V6: Firing Order: 1-6-5-4-3-2 Cylinders:
........(back) 2.........4.........6 1.........3.........5
........(front) Ignition Coil Connections:
o <--1 o <--4
o <--5 o <--2
o <--3 o <--6
I had a Beretta a while ago. I think it was an 89 or 90. It had a 3.1 engine. I don't know if the 2.8 used the same system, but at least one of the coil packs went bad and the car wouldn't start. It was running fine when I shut it off to go apply for a job and wouldn't start when I came back out. You could try looking at that.