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996 Once warm, won't idle.

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3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH996 Once warm, won't idle.

Leading reported evidence

Check engine coolant temp and air intake temp

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No successful repair reported for this finding.

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Suggestion

Monitoring/checking the engine coolant temp and air intake temp from a cold start as the engine idles and noting any anomalous temp readings might be a valuable exercise.

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996 Once warm, won't idle.
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Leading evidence: 'Check engine coolant temp and air intake temp' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check engine coolant temp and air intake temp' (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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Test ' might be

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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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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion

A 'test' might be to remove the oil filler cap and create an air leak that would compensate for the suspected overly rich mixture.

Original post Read captured discussion
996 Once warm, won't idle.
Frequently discussed actions (2)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check engine coolant temp and air intake temp

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

Monitoring/checking the engine coolant temp and air intake temp from a cold start as the engine idles and noting any anomalous temp readings might be a valuable exercise.

Original post Read captured discussion
996 Once warm, won't idle.

Test ' might be

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

A 'test' might be to remove the oil filler cap and create an air leak that would compensate for the suspected overly rich mixture.

Original post Read captured discussion
996 Once warm, won't idle.
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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.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

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Generation: 20261026T130754Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Folks, need some help if you can. We have a 1999 996 that came in for an engine replacement. Customer brought a 2001 engine in and after swapping over all the obvious stuff it fired right up, ran and idled just fine. However, once it warmed up (not too long after it is started cold) it suddenly dies. It simply won't idle. It drives around just peachy but simply will not idle once warm. This is repetative. That is, once cold, starts right up and idles fine. Once warm, dies. (but can still be driven) Any thoughts? Thanks in advance!

POST 2Original post

Not sure if this is relevant but: http://www.renntech.org/forums/topic...und-205-deg-f/ Crank position sensor problem?

POST 3Original post

Quotes source post: 8678820

Didn't '99 come with manual/mechanical throttle and idle control valve and '00 and later engines came equipped with e-Gas? Something to consider. Dying after warmed up... I would consider the coolant or air temp sensor reporting the wrong temp once warm. The sensor reports the cold temp ok but as the engine warms up the sensor still reads cold. The DME continues to provide an overly rich mxture and it is possible the engine could die from an overly rich mixture. That the engine runs when driven suggests the open throttle and resulting mixture is not as rich as it is at idle thus the engine runs when the throttle is being used. Monitoring/checking the engine coolant temp and air intake temp from a cold start as the engine idles and noting any anomalous temp readings might be a valuable exercise. A 'test' might be to remove the oil filler cap and create an air leak that would compensate for the suspected overly rich mixture. 'course, there can be a fuel supply problem, pressure problem. An engine transplant can have a electrical or vacuum line loose or damaged or a fuel line pinched, etc. Sincerely, Macster.

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