14 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHDo I have a faulty MAF??
Leading reported evidence
Adjust grub screw
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.
Discussions that contain suggestions
1
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Suggestion · Original poster
So if the car is sat idling at 800rpm, cold or hot and I Rev the engine, as the needle comes back down it goes really low to like 400 rpm almost cuts out then recovers to 800 and begins to idle properly again, it's as though the idle is too low on the throttle body( cable type) but it looks like it is factory set with no means to adjust the grub screw which the throttle mech sits on at idle.
Leading evidence: 'Adjust grub screw' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'maf or oxygen sensors' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Adjust grub screw' (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.
Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.
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 suspect a cause
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.
Suspected cause · Original poster
I'm thinking it's probably the MAF or oxygen sensors on the cats, I've checked the crankcase vacuum which seems ok, if you take the oil cap off you can hear the idle change and its sucking air in which is what it should do I'm told!!
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.
Suggestion · Original poster
I'm thinking it's probably the MAF or oxygen sensors on the cats, I've checked the crankcase vacuum which seems ok, if you take the oil cap off you can hear the idle change and its sucking air in which is what it should do I'm told!!
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.
Suggestion
Before you do anything else, you need to check the Idle Control Valve on the throttle body.
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.
Suggestion
You need those scanners to check MAF and O2 reading as well.
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
Adjust grub screw
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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
So if the car is sat idling at 800rpm, cold or hot and I Rev the engine, as the needle comes back down it goes really low to like 400 rpm almost cuts out then recovers to 800 and begins to idle properly again, it's as though the idle is too low on the throttle body( cable type) but it looks like it is factory set with no means to adjust the grub screw which the throttle mech sits on at idle.
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'm thinking it's probably the MAF or oxygen sensors on the cats, I've checked the crankcase vacuum which seems ok, if you take the oil cap off you can hear the idle change and its sucking air in which is what it should do I'm told!!
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
Unfortunately I don't have anything to read the codes I'll have to go with the clean then take it up to my indie if it still continues after that, what's the best one to get for the money ??
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
Hi DB , no codes had it up to my porsche indie who has been helping me here and there and they had it on the computer but no codes so might be what you said, I cleaned the throttle body itself with a bit of carb cleaner but didn't take off the control valve, idthere a gasket to replace when you put it back??
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
Hi DB , no codes had it up to my porsche indie who has been helping me here and there and they had it on the computer but no codes so might be what you said, I cleaned the throttle body itself with a bit of carb cleaner but didn't take off the control valve, idthere a gasket to replace when you put it back??
These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.
maf or oxygen sensors
No successful repair reported for this finding.
0
Identified cause
1
Suspected cause
0
Reported fixes
Read evidence and context
Discussions that suspect a cause
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.
Suspected cause · Original poster
I'm thinking it's probably the MAF or oxygen sensors on the cats, I've checked the crankcase vacuum which seems ok, if you take the oil cap off you can hear the idle change and its sucking air in which is what it should do I'm told!!
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.
14 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.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261026T133652Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Hi everyone!!
So I've just rebuild my car and got her running but I've got a niggle with the idle.
So if the car is sat idling at 800rpm, cold or hot and I Rev the engine, as the needle comes back down it goes really low to like 400 rpm almost cuts out then recovers to 800 and begins to idle properly again, it's as though the idle is too low on the throttle body( cable type) but it looks like it is factory set with no means to adjust the grub screw which the throttle mech sits on at idle.
I'm thinking it's probably the MAF or oxygen sensors on the cats, I've checked the crankcase vacuum which seems ok, if you take the oil cap off you can hear the idle change and its sucking air in which is what it should do I'm told!!
Anyone had this ???
Before you do anything else, you need to check the Idle Control Valve on the throttle body. You may need to remove the throttle body and remove the ICV, then clean it out. Clean the throttle body as well. Reinstall everything and see if things work right. Could be a bad ICV as well. Normally, a faulty MAF and/or O2 sensors will throw a CEL and produce codes. Any CEL and codes?
Hi DB , no codes had it up to my porsche indie who has been helping me here and there and they had it on the computer but no codes so might be what you said, I cleaned the throttle body itself with a bit of carb cleaner but didn't take off the control valve, idthere a gasket to replace when you put it back??
Ahsai
Do you think it will be the ICV from what I've said??
What should I clean it with, switch cleaner??
Is there a set way to connect the battery and should I see something move or open??
When the engine is hunting idle, the usual suspects are throttle body, ICV and intake vacuum leak. Also, the ICV is known to cause idle issues for your model so may as well clean that first.
Supply positive 9-12v to pin 2, then negative to either pin 1 or 3 (not at the same time) and the valve will rotate in different directions.
Have you checked the O2 sensor voltage and see the car is indeed in close-loop fuel control? MAF should read 1.3v @ warm idle.
Do you have Durametric or a generic OBDII scanner that reads sensor values in real-time? One of the items it reports is called "Close loop fuel control" yes/no.
You need those scanners to check MAF and O2 reading as well.
Unfortunately I don't have anything to read the codes I'll have to go with the clean then take it up to my indie if it still continues after that, what's the best one to get for the money ??
If you use Android devices, the best bang for the buck is the $10-20 bluetooth OBDII reader and the $5 Torque Pro app. If you use Apple devices, you can get the WiFi OBDII reader (more expensive) and get the #$10 OBD Fusion app.
To diagnose any engine problems, you need at least the above and ideally Durametric.
Ahsai
Was the ICV it was jammed solid!! Blasted it with penetrating oil then cleaned it out with carb cleaner, had to move it with the tip of a screwdriver to get it going it was so tightly stuck, got it moving then tried battery but it was still too tight , had to keep moving it manually ( I was very careful) and spraying more penetrating fluid it, eventually I got it so it was literally flicking open and closed so freely when I put the battery on.
Put it all back together and she's loads better
Thank you 👍👍👍👍👍👍👍👍
