I have a 2014 Chevy Sonic with 77,400 miles on it. It was Hertz Rent A Car that I purchased in 2016. Before you groan, here is the story of why I bought it. A drunk blowing .12 totaled my Chrysler Sebring the second week of January, 2016. It was 24 degrees when he hit me, 18 degrees when the tow tru…

For starters I have bought x-rental cars without problems. Now for your problem, I think there is a fault in your evap system. Not an expert, but you might cause additional engine problems driving it this way. Plus, with your CEL on you will not be able to tell if a new problem developes. Why yo…

[image] LisaMcIntire: The independent shop mechanic said not to bother Because HE cannot diagnose the problem. This mechanic is essentially admitting he doesn’t know how to fix it. Taking a big hit on the value at trade it because he won’t admit that is unacceptable. Find a better mechanic. …

Thank you for both (PureBred and Mustangman) for your input. I appreciate all suggestions. I can provide some additional information. The mechanic and I have discussed additional diagnostics. The technical information recommends a MAP diagnostic (removing the sensor, cleaning, etc.)($125). If that i…

IMHO, it’s worth fixing your car until the cost of the repair exceeds the cost of any alternative you’d consider, like buying a new car. That calculation gets complicated, weighing several unknown factors based on your budget and your current car loan, if any. Some say it’s a matter of what the car…

Once it starts, those rough starts, how long until it smooths out? Maybe something in the EVAP system that runs for a short time after startup is allowing too much air into the engine, leaning out the mixture. A valve that should be closed, or a pump running that shouldn’t be.

[image] Mustangman: This mechanic is essentially admitting he doesn’t know how to fix it. Taking a big hit on the value at trade it because he won’t admit that is unacceptable. Find a better mechanic. A mechanic who’s not willing to spend a customer’s money chasing a problem he can’t solve so…

Honest is admirable but won’t get the OP’s car fixed.

The first thing you do is replace the evap purge valve P0496 is very often caused by a faulty evap purge valve Don’t bother cleaning the MAP sensor . . . I don’t know why the guy even recommended that. Nobody cleans MAP sensors You really need a better mechanic, one who is capable of diagnosing …

I concur w/ @db4690 above, very good chance the cause of the hard to start after filling the tank is a faulty purge valve. Here’s why. As gasoline fills the tank during re-fueling, the air & fuel vapors above the fuel level are pushed into the car’s charcoal canister, which holds onto the fuel, …

Do I keep spending money to diagnose my Sonic?

Maintenance/Repairs

old_mopar_guy December 30, 2019, 10:54pm 7

Whitey is absolutely right. What your car may be worth to someone else is meaningless. The calculation is between what it costs to fix this car vs. what it would cost to buy something else.

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Do I keep spending money to diagnose my Sonic?

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