12 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHCar Shudders when Accelerating??
Reported or suspected cause
spark plugs
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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Discussions that report identifying a cause
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Reported cause
I've had a few cars shudder/lose power under heavier acceleration and in both cases it turned out to be spark plugs.
Leading evidence: 'spark plugs' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'spark plugs' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check plugs and coil packs if they have not been' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Replace sparks plugs and coil packs about 500 miles ago
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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Performed · outcome unconfirmed · Original poster
I changed the sparks Plugs and Coil packs about 500 miles ago
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Performed · outcome unconfirmed
While they need to be replaced, very few actually break (come apart).
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Suggestion
If you can I'd scan for any codes and check your plugs and coil packs if they have not been replaced.
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Suggestion
go ahead and change the front transmission mounts as well.
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12 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
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Generation: 20261027T053112Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I had just told someone today how great my car was driving , and as I started driving home from work the car started Shuddering whenever I accelerated. I thought I was on a bad patch of freeway at first, but the more I gave the car gas it shook horribly, then when I let off the gas it would go away. C'mon people, what do you think the problem is? I am thinking Motor Mounts or Tran Mount or something bigger?
Any check engine lights? If you can I'd scan for any codes and check your plugs and coil packs if they have not been replaced. The coil packs have been known to crack.
Does it feel like the engine is missing with power loss when its shuddering, or does it stay strong and just shake the car? I've had a few cars shudder/lose power under heavier acceleration and in both cases it turned out to be spark plugs. No codes for either.
Ironically, one of those cars did have a coil pack go bad a few years earlier. The entire car started shaking at any speed, and I got a code telling me exactly which pack was out.
Oh, man, you're not supposed to say that kind of stuff out loud!
It might be worth making sure all coil packs are correctly seated - spark plugs are correctly torqued. 500 miles is enough miles to jiggle something loose.
I would pull codes and look for misfires. You might have a mass airflow sensor issue or something else causing misfires, assuming that�s why it�s running rough.
Pending (stored) codes for misfires may also show another, more specific, code.
Sure, plugs and coils may fix it, but I cannot tell you how many times people replace those and it doesn�t fix the issue. Same with motor mounts. While they need to be replaced, very few actually break (come apart). Mostly they just hang and cause handling wonkyness.
Replaced the motor mounts this weekend and the car is not shuttering anymore, drivers side mount was dust, passenger side was not much better. Only thing now, is when I was removing the wiring from the secondary air box my hand slipped and my oil filler tube broke in half. Not looking forward to taking everything off to replace that!!
go ahead and change the front transmission mounts as well. I unbolted mine and was able to wiggle it a good inch in all directions. Half of the bushing had disintegrated!!!
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