# NHTSA Engineering Analysis EA85043
> **UNWANTED VEHICLE ACCEL** · Opened 1985-08-21 · Closed 1987-07-21
## Investigation
- **Action number:** EA85043
- **Type:** Engineering Analysis
- **Open date:** 1985-08-21
- **Close date:** 1987-07-21
- **Manufacturer:** Chrysler (FCA US, LLC)
- **Affected makes:** AMERICAN MOTORS; RENAULT
- **Affected components:** VEHICLE SPEED CONTROL:LINKAGES
- **Affected model years:** 1983, 1984
- **Affected (make, year) variants:** 4
## Summary

SUMMARY: MANUFACTURER CLAIMS MOST REPORTS ARE A SHIFT-FLARE CONDITION OFHIGHER ENGINE SPEEDS DURING THE NO-LOAD SHIFTING TIME INTERVAL.THIS CLAIMDOES NOT APPEAR TO BE SUBSTANTIATED BY THE REPORTS.REPORTS DO NOT FOLLOWTHE TYPICAL SCENARIO OF SUDDEN ACCELERATION OCCURING WHEN THE VEHICLE ISPLACED INTO A DRIVING MODE.MANY REPORTS OCCUR WHEN SHIFTING INTO ANY GEARAT ANY SPEED.ALSO SOME REPORTS OF SEVERE ENGINE DAMAGE.ANALYSIS: ALTHOUGH THERE APPEARS TO BE A DESIGN FLAW IN THE SPEED CONTROLLOOP, MOST OF THE COMPLAINTS OCCUR AT SPEEDS WHICH ALLOW TRANSMISSION DIS-ENGAGEMENT.IN ADDITION, THIS TENDS TO BE AN INTERMITTENT TYPE OF FAILUREWHICH IS HARD TO TRACE TO A SINGLE SOURCE/CAUSE/COMPONENT, ALTHOUGH THE ISAMOTOR HAS BEEN CITED BY SEVERAL OF THE CONSUMERS AND FIELD REPRESENTATIVES.STATUS: C-MEMO DRAFT FORWARDED TO (H) 6/16/87.===

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA85043)
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