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For $300 Pick n pull will sell you an entire engine with every computercomponent you need to run it. I reccomend that you get you manual and memorize the name and location of each sensor and actuator. The names are pretty self explanatory, and usualy give you a fair idea of what they do. Armed with that knowledge, you can compare the symptoms to the shop's hypothesis, and consider if it seems to make sense or not.
Then there are the basics....
Do you have:
spark
fuel
compression
If you are missing one of these, diagnosis is half done.
if you have them all, it is a timing problem(could be machanical or electrical).
I drive a diesel, and it will run with only one wire. Gotta love that.
As for costing thousands....my friend took her moms 91 945 (mom got an XC), withthe warning that it took $350 a month in maintainence at the shop. Now, about a year down the road it has cost maybe $500 including fresh tires fuel pump, tune up, bushings, brake job and a new FPR. Drives better than ever. at the shop, thousands come up pretty fast, but for most, that is an easier road than becoming a Volvo expert.
AS an example, I recently diagnosed a failed VSS(Vehicle speed sensor)by intuition. The dealer charged $130 to confirm my opinion(sucka didn't have faith in my diagnosis), and offered to replace the $40 part for a further $180, resetting of check engine light included. I reached under the car in their parking lot, using a had with working fingers and a 1/2" wrench, and replaced the part in 3 minutes, then reset the check light by disconnecting the battery fro a minute. Dealer rate @$3400.00/hour on that job. My friend just laughed at me when I asked for half of that. Best of luck.
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