20 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH996 to 986 Instrument Cluster question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Reported or suspected cause
tank is empty
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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 report identifying 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.
Reported cause · Original poster
The problem is the tank is empty when the gauge reads 1/4 tank.
996 to 986 Instrument Cluster question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary
Leading evidence: 'tank is empty' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'tank is empty' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Adjust sending unit' (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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed
The 996 cluster was designed to be used with two different gas tanks, the regular one used on the two wheel drive cars, and a saddle shaped one used on the four wheel drive cars.
996 to 986 Instrument Cluster question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use with two different gas tanks, the regular one
Performed · outcome unconfirmed
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 performed work without a confirmed outcome
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.
Performed · outcome unconfirmed
The 996 cluster was designed to be used with two different gas tanks, the regular one used on the two wheel drive cars, and a saddle shaped one used on the four wheel drive cars.
996 to 986 Instrument Cluster question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Adjust sending unit
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
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 wonder if I add a potentiometer and adjust the sending unit to half a tank would that work?
996 to 986 Instrument Cluster question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Check with durametric
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
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
The Enthusiast version will not do it to my knowledge, you would need to check with Durametric on that.
996 to 986 Instrument Cluster question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Run gauge calibration
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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
As the result, it had to be calibrated to the car by draining the tank completely, then refilling it to a specific volume of fuel; 12 liters for a two wheel drive, 28 liters for a four wheel drive car, then running the gauge calibration on the scan tool.
996 to 986 Instrument Cluster question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use on the four wheel drive cars
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.
Performed · outcome unconfirmed
The 996 cluster was designed to be used with two different gas tanks, the regular one used on the two wheel drive cars, and a saddle shaped one used on the four wheel drive cars.
996 to 986 Instrument Cluster question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Use with two different gas tanks, the regular one
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that performed work without a confirmed outcome
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.
Performed · outcome unconfirmed
The 996 cluster was designed to be used with two different gas tanks, the regular one used on the two wheel drive cars, and a saddle shaped one used on the four wheel drive cars.
996 to 986 Instrument Cluster question - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Coverage and how to read this overview
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.
20 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
986Forum: 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: 20261026T065735Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Has anyone discovered the eeprom re-programming to make the gas gauge work correctly with a 2002-2005 996 c4 gauge transplant? The problem is the tank is empty when the gauge reads 1/4 tank.
I understand I may be able to get the dealer to re-code the fuel tank type or I may be able to hack the sender, but I thought I would check to see if anyone has made progress with the eeprom.
I have done two of these any never had that issue. I just finished my last swap last week. 2003 Boxster S with a 2002 911 C4 Cab cluster. Gauge is spot on.
Not sure that helps but I have not had that issue.
These fuel level gauges are programable with everything from a PST II to the Durametric system; you simply need to follow the recalibration procedure in the service manual.
JFP Thanks for your response. I have come to have great confidence in your advice.
A little more help please. I have the Enthusiast Durametric and best I can tell neither it or the professional version will calibrate the fuel tank. Am I wrong?
This is my hobby car and I dread going to the dealer and explain that I have cobbled the cluster and that I want him to PIWIS it as a 996 and calibrate my fuel. My sense is the dealer will not want to mess with me. I may try a few other thing first.
Anyone?....Particlewave? ..Does anyone know the eeprom bits in the newer blue grey and green connector cluster for a 986 to turn on the oil pressure and voltmeter? or alternately, does anyone know the eeprom bits to go from 20 gal to 16 gal fuel in the 996 blue grey green cluster?
Another possibility, at this point my sending unit span is from 12 ohms full to 300 ohms empty. I wonder if I add a potentiometer and adjust the sending unit to half a tank would that work? I'm not sure because I think my cluster is set to do that final 1/4 calculation so my OBC would be wrong.
Finally, I can just go on living and knowing that I am out of gas a 1/4 tank. None of this is super important on a hobby car, just fun.:dance:
The Enthusiast version will not do it to my knowledge, you would need to check with Durametric on that. The 996 cluster was designed to be used with two different gas tanks, the regular one used on the two wheel drive cars, and a saddle shaped one used on the four wheel drive cars. As the result, it had to be calibrated to the car by draining the tank completely, then refilling it to a specific volume of fuel; 12 liters for a two wheel drive, 28 liters for a four wheel drive car, then running the gauge calibration on the scan tool.
As the cluster's electronics for the gauge are somewhat different, I do not know if any data can be lifted from on and transferred to the other, but I do know that the factory calibration system does work.
What?
I already bought one.
I’m telling you that you can rent a full-function durametric from eBay to calibrate your gauge rather than go to the dealer.
Bill Ladd
I just talked to Owen at Durametric. The Professional does not calibrate fuel on a 986 and in fact Owen says that the professional does not do any more then the enthusiast for a 986. So for a 986 the enthusiast version is as good as it gets. I did not know this. Now I do.
Interesting, but not sure that is correct; their own site says you cannot activate the cruise control on a 986 with the Enthusiast, but rather need the Pro.......unless something has changed.
If I get a chance, I will hook up my Durametric pro and see if it gives me option to calibrate fuel gauge.
I'm crazy busy lately, so it will be a few days if I get that chance.
The only difference between the Enthusiast and Pro versions has always been the number of VINs that can be stored (3 vs unlimited) and neither can do fuel gauge.
A new approach......Is there anybody out there that has done this 996 blue grey green connector cluster into a 986 and everything works including the fuel gauge calibration that can share a download of their eprom.
This may help, is from the 996 factory repair manual. A known issue with fuel level readings on empty tanks after a battery disconnect.
Sent from my POCOPHONE F1 using Tapatalk
What is the year of your car? (It has been a while since I installed my 996 cluster and I have forgotten the colors of my connectors.). If you have the LCD-type cluster I have the EPROM dumps from both the 986 and 996 clusters I used in my 2000. The files are stored on a hard drive and I should be able to find them this weekend.
By a process of elimination you may be able to determine which line of code controls the fuel gauge and update the offending bits.
This post
http://http://986forum.com/forums/boxster-general-discussions/43017-carrera-gauge-swap.html
shows the code for the old style cluster. Lines 1 through 3 of the code include the odometer reading and the VIN. One of the remaining lines probably has the fuel tank type encoded.
This is a source reference. Confirm exact model applicability in the original material.
