I recently had a new motor installed in my '08 Fit Sport. Almost immediately, I noticed a thump in the engine when idling at red lights. The frequency varies wildly but it's always there and seems to be more frequent after higher speed highway driving. Repeated trips to the shop that installed the motor and a new set of motor mounts have done nothing to stop this. No error codes pop up. The only time it's gone away was after adding a bottle of Lucas high mileage. The thump returned with the next tank and remained even after adding another bottle on the following tank. Independent of the thump, the new motor also doesn't idle smoothly. It occasionally drops a bit below 500rpm and revs up a little on it's own with no ac or heat running. The original motor didn't do this. Does this ring a bell with anyone?

 

I can't comment on the noise, but try letting it go through "Idle Learn" to fix the above. Start the engine, hold the RPMs at 2-3k until the radiator fan runs. Turn off all accessories: HVAC (including the blower), exterior lights, audio system, rear defroster, anything else you can think of. Let the engine idle for 5 minutes undisturbed. If the radiator fan runs again, don't count its run time as part of the 5 minutes.

 

Det du beskriver høres veldig ut som et problem som ikke nødvendigvis er selve motoren, men noe rundt installasjonen eller tomgangssystemet. Etter motorbytte er det ganske vanlig med små vakuumlekkasjer, feil jordingspunkter eller en momentomformer som ikke helt oppfører seg riktig, og det kan gi en “thump” eller ujevn gange på tomgang. At det blir verre etter motorveihastighet peker også litt mot enten girkassebelastning eller en lekkasje som endrer seg når ting blir varme. Lucas-tilsetningen kan midlertidig maskere symptomer ved å endre forbrenning eller drivstofftrykk, men løser sjelden grunnproblemet. Jeg ville sjekket alle vakuumslanger, PCV-systemet og også sett på tomgangsregulering/fuel trims med diagnose før man går videre. Roobet Life er kjent for sitt enkle grensesnitt og varierte roobet casino casinospill for både nye og erfarne spillere.