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Discussion Starter #1
My Forester xt has had issues with an acceleration lag typically in the 1500-2000 rpm, usually going uphill or accelerating from a stop. It has been getting worse lately to the point where I floored the gas pedal and could not accelerate past 40mph while trying to merge onto a highway. I was almost hit by a semi.
I just took it to the dealership yesterday and they acted as if this is a novel problem. A five minute internet search shows this to be somewhat common.
What solutions worked? How did anyone convince Subaru to take accountability? This was my first new car (maintenance 100% by Subaru dealerships and on time) and I want to love it, but I'm about ready to sell it and never buy another Subaru again. It's dangerous to drive and I'm scared of the unpredictability.
 

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2015 XT Touring CVT
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269 Posts
Sounds like you aren't building boost. Are you tuned? So you have any way to measure engine parameters?
 

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It is a common problem. With "lag" you mean turbo lag or do you mean that the car just feels lumpy and slow? Just getting the language straight. Does your car even have a turbo?
Does the check engine light come on when it does this?

We could talk you through things to try but before we do, it may be good to tell us what you're comfortable and capable of doing. Do you have an OBD2 reader, tools, etc?
Forgive my Dutch bluntness and please understand this is not a form of misogyny - I ask this question of everyone before expounding on explanations, if the skill level cannot be determined in the first post. You're clearly a woman and I mean nothing by it.
Don't want to get into explanations if they cannot be understood or executed because that's a waste of all our time.

I'd seriously consider bringing your car to an independent subaru specialist and stop going to the dealer.
Perhaps indicate your location. Others here may be able recommend a solid mechanic.
 

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Discussion Starter #4
Thanks for your reply Remco. I have a fairly basic understanding of cars but not hugely knowledgeable.
By lag I mean - I push on the gas pedal and the car is unresponsive for up to 5 seconds meaning no change in Rpm and speed from a stop or going uphill. Another incident happened when I was unable to reverse the car up my driveway when applying gas in reverse with the parking brake off.
No maintenance or check lights have ever come on when this happens.
I do not have specialized tools.
I can take my car to any location near Denver CO.
Appreciate the straightforwardness. My car is still at the dealers until Tuesday at the least and I'm hoping to maybe have some ideas when they can't replicate the problem. We told them it mainly happens uphill when you need power, and they drive it two miles on flat roads.
 

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It could be a number of things, from simple to not so simple - from cheap to quite expensive.

Not positive whether your car has an EGR (I forget) but a clogged one could cause those sorts of issues - often it can be fixed with a 5 dollar can of cleaner.
On the other hand, a blocked catalytic converter (part of your muffler, from where you are sitting), could do that as well - that's an expensive thing to replace. It is often also mis-diagnosed. Often dealers load up the parts canon, replacing a bunch of parts near it. They'll replace sensors near it that a could cause it.
$2500 bucks later and they car runs well, sure, but you're out a lot more money than you should be.

A dealer wants you in and out and not come back.
As such, it is in their interest to replace whatever possibly could cause the issue. They mark parts up, labor is expensive. It isn't in their interest to spray some cleaner in an EGR valve, for instance. They'll replace the valve, a bunch of hoses, charge you two hours.

Couple that with the fact that you're a woman and you don't know that much about cars.
Hate to say it but they often take advantage of that.

On the other hand, a good diagnostician will take the time to find what's actually wrong. That's not to say dealers do not have that ability but that's probably few and far in between. Independent shops just tend to be better at solving issues. They are hungrier and count on repeat business and recommendations.

That being said, anyone here know someone for Jessie to take her car to near Denver CO?
Edit: perhaps change the title of this thread to ask for a good mechanic in Denver CO?
 

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2012 Forester 4 speed auto
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The first thing the dealer is going to check in the Fuel System. If that is ok then perhaps the ignition timing isn't advanced enough to accelerate the engine. He will check the MAF sensor or look for any vacuum leaks. I agree its a dangerous car to drive but a good dealer ship should be able to qualify the fuel pump and any sensors. That is, he should be able to determine if they are indeed inoperable or defective before he replaces them. If he cannot do that then look for another mechanic who isn't guessing at your expense.
 

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Discussion Starter #9
I'm under extended warranty on the entire car so the cost hopefully isn't stopping then from exploring options. Thus far they stopped at - we could not replicate the problem so can't do anything. They didn't duplicate failure conditions so there's that... So far I'm not that impressed with groove Subaru.
 

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2019 Touring CVT
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I'm under extended warranty on the entire car so the cost hopefully isn't stopping then from exploring options. Thus far they stopped at - we could not replicate the problem so can't do anything. They didn't duplicate failure conditions so there's that... So far I'm not that impressed with groove Subaru.
Ask to have a technician go on a drive with you. Then you can drive in the situations that will recreate the problem.
 

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2017 XT Limited + Tech
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304 Posts
Have you checked out the older posts regarding swapping the turbo hose clamps? I think the original complaints were similar to yours.
 
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