Have I got a Rod Knocking?

[hardmoney]

Ok, I was on the freeway the other day and heard a load knocking, pulled over to the side of the road and its coming from the left side of the engine. I decieded to do the unthinkable and drove home(80 miles). The car did not overheat, as a matter of fact it actually ran cooler than normal(about one quarter of the way up) The needle seemed to kind of bounce a little and fluctuated a little between halfway and quarterway up. Fuel consumption was normal and the car doesnt even really ride rough just the noise really. I didnt take it past about 2200 rpms but after about 1800 rpms the car knocking is joined by a clatter, I was running 91 octane and wasnt driving it hard just cruising at about 75 mph.I checked the Ecu and only came up with a 5-5 code, A search didnt return anything that really fit this bill. Any ideas?

[elwesso]

could you maybe take a video or sound clip?

[maxnix]

What year? Not in your profile.

[Rex]

What year? Not in your profile.

He's got 2 1990's.

This info is in his sig, but we know you have sigs turned off.

================1990 Q45t 422,000 miles Grey with custom black/grey two toned interior,pop charger, custom diamond plate cold air intake box.eibachs/tokicos 18 inch velocitys with 245/40/18 painted calipers,cross drilled bradi rotors,all urethane bushings,chromed out plastic in back with 35% chrome tint and 94-96 badging ,Xenon bodykit,custom ac shcnitszer exhuast,remote keyless entry/start insane 1000watt sound system and a million other knick things im forgeting right now.

1990 Q45t 170,000 miles Black with black/grey interior, chrome 18 inch wheels on 245/40/18s. Rear of the car lowered with eibach front remains stock(got rid of the rake)

2004 Honda S2000 16,000 miles Silver with black/red interior, bone stock.

1984 Jeep CJ5 78,000 miles Black/Black with 32's

[hardmoney]

Good Idea Wes, Ill put a video clip up tommorow, oh and by the way its my Black 90.

[BlackBirdVQ]

Timing chain guides done ? Usually rod knock makes itself most noticable around 2400RPMs.

[PopPop]

Ok, I was on the freeway the other day and heard a load knocking, pulled over to the side of the road and its coming from the left side of the engine. I decieded to do the unthinkable and drove home(80 miles). The car did not overheat, as a matter of fact it actually ran cooler than normal(about one quarter of the way up) The needle seemed to kind of bounce a little and fluctuated a little between halfway and quarterway up. Fuel consumption was normal and the car doesnt even really ride rough just the noise really. I didnt take it past about 2200 rpms but after about 1800 rpms the car knocking is joined by a clatter, I was running 91 octane and wasnt driving it hard just cruising at about 75 mph.I checked the Ecu and only came up with a 5-5 code, A search didnt return anything that really fit this bill. Any ideas?

If it's coming from lower block or oil pan area probably you've spun a rod bearing. Have you ran a compression check or oil pressure check on your engines because they have a lot of miles on them!

[hardmoney]

Im having trouble posting my video, is there a trick to this? the file is 850kb and in real player format

[elwesso]

email it to me and ill host it...... [email protected]

[texasoil]

what you may have eexperienced is piston failure caused by continuous detonation progressing to pre-ignition. The ECU system really advances the timing a lot under light loads to maximize economy and knocking is most often encountered under the moderate load conditions you describe. The knock sensors should have adjusted the timing back to stop the knock--but maybe did not have enough adjustment to take the lower fuel octane. I find it hard to accept a rod bearing failure under light cruise conditions.