Rattle Or Knocking Noise At Cold Startup

[PCW]

Has anyone experienced a rattle or knocking noise first thing in the morning when you first start the RX400h and the gas engine come on? I have noticed this on ocassion, but it seems to go away after the engine warms up. I had the dealer look over the engine a few weeks ago and they could not find anything that appeared to be loose.

Any ideas would be appreciated.

[rexmiami]

If you are using 87 octane gas it is possible that you need to go up a grade. I have been using 87 octane in Seattle and have not experienced any knocking.

[PCW]

If you are using 87 octane gas it is possible that you need to go up a grade. I have been using 87 octane in Seattle and have not experienced any knocking.

Thanks. Using 89 octane Mobil. It's not that kind of noise, it's like metal-on-metal knocking together.

[katzjamr]

i had that problem with my old explorer on cold startup, it was a timing chain problem. after sitting overnite on cold startup there would be a ten second rattle like marbles in the engine until it was lubed. i dont know if this is your issue, it was a known problem in 99 ford explorers with the v6

[PCW]

i had that problem with my old explorer on cold startup, it was a timing chain problem. after sitting overnite on cold startup there would be a ten second rattle like marbles in the engine until it was lubed. i dont know if this is your issue, it was a known problem in 99 ford explorers with the v6

Thanks. That's very interesting!

[LexInfo]

i had that problem with my old explorer on cold startup, it was a timing chain problem. after sitting overnite on cold startup there would be a ten second rattle like marbles in the engine until it was lubed. i dont know if this is your issue, it was a known problem in 99 ford explorers with the v6

Thanks. That's very interesting!

it might be your injectors ticking, they have the same problem on the 330's