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Old 04-21-04, 12:36 AM   #1
chaotic
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Unhappy engine ping

hello i have a 1990 ls 400 with 161,000 miles.. i am noticing a ping when i press on the gas slightly... i have always run premium gas in it... can anyone tell me of any possible problems?? someone told me it could be the computer i hope not....
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Old 04-21-04, 03:18 AM   #2
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Could be a number of things.
How long has it been pinging for?
When was your last complete tune-up?
Possibly bad 02 oxygen sensors.
You might have some water in your gas from receiving a bad batch of gas.
Could also be just the switch over from winter gas to summer gas in your local area.

I would try using a can of octane boost at your next complete fill up and see if that makes a difference before you start messing with the computer.
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Old 04-22-04, 12:34 AM   #3
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Its been pinging for the last couple of months but seems to be getting worse... i put sone octane booster in but it didnt seem to make a difference........
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Old 04-22-04, 12:49 AM   #4
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Quote:
Originally posted by chaotic
Its been pinging for the last couple of months but seems to be getting worse... i put sone octane booster in but it didnt seem to make a difference........
Who told you it might be the computer?
I am leaning towards that now as well since you tried octane booster and said it's been a few months and getting worse.
Could still be bad O2 sensors but that's a 50/50 shot.
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Old 04-23-04, 01:17 PM   #5
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chaotic,

Sounds like the same problem with my 90LS. Early 90LS has a tendency to ping when slightly gas but the ping goes away after that. My guess is Lex engineers advance the timing a bit too much when slightly throttled to give a good punch feeling (acceleration) and smoother engine at the expense of denotation, which becomes noticable when the car aged. My 91LS doesn't give a good punch when slightly throttled nor does it ping.
I tried swapping the ECU between 90&91, and as I predicted the car with 90's ECU pings. I permanently replaced the 90's with a used 92's ECU and she happily consumes regular gas without any ping. Read the TSB if you want more info on this subject. Let's us know the results!
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Old 05-07-04, 01:15 PM   #6
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Default My 1990 173K miles LS400 pings

Was the 92 ECU a simple replace on the 1990 or was there more to it than that? What does a used or new ECU go for?
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Old 05-14-04, 09:02 PM   #7
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Could you let me knoe where i can maybe find a used ecu, and about how much do they cost?
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Old 05-20-04, 10:18 AM   #8
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90-92LS ECUs are 100% interchangeable. I can't speak for the 93&94 but I don't see why not. I got the ECU on eBay for ~$160 on a good day.
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Old 07-09-05, 12:44 AM   #9
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bringing this back from the dead, but my 90 has the same problem, light gas and 1200 rpm and it will ping slightly, nearly 150k miles....i'll have a shop check my o2 sensors

I'll retard the timing soon and if that doesnt work i'll pick up a 92 ecu
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Old 07-09-05, 12:44 AM
 
 
 
 
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