5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCH2002 C4 Cranks No Start (Already replaced fuel pump and CPS)
Reported or suspected cause
pump
Reported cause
No successful repair reported for this finding.
1
Identified cause
0
Suspected cause
0
Reported fixes
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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.
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.
2002 C4 Cranks No Start (Already replaced fuel pump and CPS)
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Leading evidence: 'pump' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'pump' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check fuel pressure' (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 · Original poster
So, I have replaced the CPS, fuel pump, fuel pump relay seems to be fine as I can hear the pump priming.
2002 C4 Cranks No Start (Already replaced fuel pump and CPS)
Replace whole fuel pump and fuel sender assembly
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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.
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 · Original poster
We replaced the whole fuel pump and fuel sender assembly.
2002 C4 Cranks No Start (Already replaced fuel pump and CPS)
Check fuel pressure
Suggestion or failed attempt
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
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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.
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.
2002 C4 Cranks No Start (Already replaced fuel pump and CPS)
Check fuses, dme and fp relays
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
Assume you've checked all the fuses, DME and FP relays?
2002 C4 Cranks No Start (Already replaced fuel pump and CPS)
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.
5 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.
1 acknowledgements have no verified action link; they do not establish a repair result.
Hi guys!
This is my first post in this forum but a long time lurker. I have been learning a lot in this forum but I have an issue I'd like to discuss.
I am trying to troubleshoot my car's starting problem. It is a 2002 3.6L Carrera 4 tiptronic.
A few months ago it started to fail warm/hot starts. It would crank but wouldn't start, so I got a brand new CPS installed and it would start fine. However, over the course of a few weeks I could feel it getting harder to do warm/hot starts.
Last week, took the car to get petrol but failed to start at the station. It would crank but it wouldn't start, there was no hum in the frunk where the fuel pump is, so got it towed to get a new fuel pump installed.
Picked up the car last week Wednesday, drove fine for two days. Went to start it on Friday night (cold start) and it failed. Again, it would crank but failed to start. However, the fuel pump is working (I assume) as I can hear it hum for a couple of seconds when I turn the key to the ON position.
So, I have replaced the CPS, fuel pump, fuel pump relay seems to be fine as I can hear the pump priming. What do you guys think?
Thanks!
Fuel pressure regulator? Sounds like your car has a fuel delivery problem somewhere along the line. Air, spark and fuel is what makes an engine work. Check fuel pressure on the injector rails. There is a valve specifically for that purpose.
Thanks guys for the replies!
My mechanic came over last night to check it out. He brought over a new fuel pump relay, we swap out the old one but no luck. I tried my other key, same situation.
He then pulled out the fuel pump he installed. When we got it out we could hear something was loose inside. Something was rattling when we shook it so something wasn't right. The pump internals would still move/make a sound when we energized it.
He took the pump away and will have a look at it on the bench, and also try to ask the place he got it from for a replacement.
I will report back!
Problem solved! We replaced the whole fuel pump and fuel sender assembly. Turned the key, let the pump prime the fuel lines, and it started right up. Let the car idle a couple of minutes, went out for a 15min drive, and all was fine.
The fuel sender was fine but we thought what the hell let's get a done while we were there. It was the pump that we received that was bad.
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