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Discussion summary
YOUR RESEARCHWhat could be the cause of hesitation when accelerating?
Leading reported evidence
Clean before fitting
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Performed · outcome unconfirmed · Original poster
Tank was spotlessly cleaned before fitting but injectors are another thing for the list.
What could be the cause of hesitation when accelerating?
Frequently discussed work
Check fuel pressure as it also seems
No successful repair reported for this finding.
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Suggestion · Original poster
I also thought fuel delivery may be another problem, I was going to check fuel pressure as it also seems to crank the engine longer before it actually fires, more than it did before this issue, this has been happening as long as I've had the hesitation in acceleration, probably for about 3 weeks but the car has hardly been driven in this time so not many miles to actually get a decent idea.
What could be the cause of hesitation when accelerating?
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Leading evidence: 'Clean before fitting' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'really' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check fuel pressure as it also seems' (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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Suspected cause
Nothing worse than heading off for a long trip wondering if a problem is really solved or just hibernating.
What could be the cause of hesitation when accelerating?
Check fuel pressure as it also seems
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion · Original poster
I also thought fuel delivery may be another problem, I was going to check fuel pressure as it also seems to crank the engine longer before it actually fires, more than it did before this issue, this has been happening as long as I've had the hesitation in acceleration, probably for about 3 weeks but the car has hardly been driven in this time so not many miles to actually get a decent idea.
What could be the cause of hesitation when accelerating?
Check maf, tps etc etc
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
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Unsuccessful attempts
1
Discussions
Read evidence and context
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
What could be the cause of hesitation when accelerating?
Clean throttle body
Suggestion or failed attempt
No successful repair reported for this finding.
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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion
Also as per N997B, although if thinking about the throttle I'd be cleaning the throttle body.
What could be the cause of hesitation when accelerating?
Frequently discussed actions (6)
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Check fuel pressure as it also seems
No successful repair reported for this finding.
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Read evidence and context
Discussions that contain suggestions
1
0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.
0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.
Suggestion · Original poster
I also thought fuel delivery may be another problem, I was going to check fuel pressure as it also seems to crank the engine longer before it actually fires, more than it did before this issue, this has been happening as long as I've had the hesitation in acceleration, probably for about 3 weeks but the car has hardly been driven in this time so not many miles to actually get a decent idea.
What could be the cause of hesitation when accelerating?
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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
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Generation: 20261026T161109Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I have been experiencing a bit of hesitation when accelerating and want to get to the bottom of it ASAP as I was hoping for a blast out on Sunday. I have changed spark plugs already and I have a set of coil packs to be fitted next but I wondered if it may be something else before I start chucking more money at it on parts that are not the cause, MAF etc. I had a misfire a month ago which turned out to be a coil pack, I wonder if more are on their way out?
I also thought fuel delivery may be another problem, I was going to check fuel pressure as it also seems to crank the engine longer before it actually fires, more than it did before this issue, this has been happening as long as I've had the hesitation in acceleration, probably for about 3 weeks but the car has hardly been driven in this time so not many miles to actually get a decent idea.
Agreed, they are paid for and are an easy swap, just thinking ahead that if I need to order parts in advance to make sure they arrive and are fitted before Sunday so I can do that in advance. If there is a known problem this would help that situation.
As soon as I saw the thread title I thought fuel delivery due to something not being right after your tank replacement.
Does the car live outside? If it's not being used much and we've had a lot of damp weather, could also be some water ingress with your coil packs.
Since watching the videos in the below link, if I didn't have coils ready to fit, I'd be bringing my car to someone with an oscilloscope and proper testing equipment as I had never realized how good they are at identifying misfires.
Worth a watch even if it only out of morbid curiosity
https://www.picoauto.com/library/videos
My thought too with the recent tank issues but every chance it could be something electrical?. The 996 is locked away and has been for the last few months apart from a few trips, the 944 know's who's boss, that's on the drive under a cover.
I hate not using cars, they don't like it.
That's the beauty of the picoscope as it can map ignition, injection, compression etc simultaneously. It can check the MAF, TPS ETC ETC.
I did think of your fuel tank problem, but thought that had been solved...
I think the money spent getting it tested would give you peace of mind. Nothing worse than heading off for a long trip wondering if a problem is really solved or just hibernating.
The guy Frank Massy that does the videos really seems to know his stuff. If you don't know someone with a scope, might be worth phoning him to recommend someone near you as he trains people too from what I can gather.
Best of luck solving it.
Tank was spotlessly cleaned before fitting but injectors are another thing for the list. The fuel pump that is now fitted is the one that came with the sender so I may swap that back to my original.
Fuel system and coil packs are the logical first choice as Chris, Adrian, Alex et al have mentioned.
If the problem isn't these things, maybe look at the throttle system? Could there be a fault in the fly by wire system? :dont know:
Does it seem to be Rev related or pedal related. Mine hesitates slightly if you let the throttle pedal all the way up. If I keep slight pressure on the pedal it doesn't seem to do it.
As above. Also as per N997B, although if thinking about the throttle I'd be cleaning the throttle body. An old fashioned cause for hesitation which people seem to forget about these days is a gunked up throttle body.
