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Author
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Topic: car pings under load or heavy acceleration
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1bdpone
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Member # 6708
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posted
 
 
Just got home from a trip to Reno this weekend. Mustang drove perfect up there and half way home. started to ping around the Sacramento area. It only pings if I accelerate hard or am going up a hill. No ping if just maintaining speed. I did stop for gas right outside of Reno on the way back. Put 89 in the tank (I alway run 89). Any suggestions would be great.
BTW, it's a 93 GT with 137k miles. Got 25mpg on the way up there looks like I got the same on the way home. Also, car ran cool to cold both ways. No pinging in the mountains on the way home.
[ June 24, 2007, 06:06 PM: Message edited by: 1bdpone ]
Posts: 182 | From: Tri Valley | Registered: Apr 2006
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1bdpone
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Member # 6708
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Thanks for all the replies.... ![[Frown]](frown.gif) Here's an update for those who care....
Cleaned the MAF (even though it didn't show any dirt) and topped off the tank at a local gas station. It doesn't ping anymore. Also, got almost 29mph coming down from Reno.
Posts: 182 | From: Tri Valley | Registered: Apr 2006
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Camaro Kid Z/28
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Member # 3100
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when you go up in elevation the air gets thinner which leans out the car. I had a problem where I ran 103 octane and the car ran like crap(even if i advanced the timing) when you drive to places like reno i always run a lower octane gas. it was maybe a combonation of thin air and bad gas? imo.
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1973 Camaro Z/28(clone)
http://www.cardomain.com/ride/2649130
"4-eyes forever essay!"
Posts: 6429 | From: 408 | Registered: Jul 2003
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1bdpone
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Member # 6708
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The car kicked butt in Reno. It started running like crap when I got back down to the Sacramento area. At least it is running fine now.
Posts: 182 | From: Tri Valley | Registered: Apr 2006
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uncle bill
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Member # 3953
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quote:
Originally posted by Camaro Kid Z/28:
when you go up in elevation the air gets thinner which leans out the car. I had a problem where I ran 103 octane and the car ran like crap(even if i advanced the timing) when you drive to places like reno i always run a lower octane gas. it was maybe a combonation of thin air and bad gas? imo.
just the opposite, thinner(less oxygen) air means richer mixture.1bdpone #1 get your car tuned(check the currant air-fuel mix)it may need to be adjusted.until then spend the money for some 91 or greater fuel or back out some timing. pinging kills pistons
Posts: 415 | From: antioch | Registered: Dec 2003
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Jdub07
( O Y O )
Member # 2728
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Prolly bad or not so good gas, was 89 not 91 and went from high altidute down to Sac. timing could be offed a little. Usually any altidute change like that in my car requires a timing adjustment and sometimes even takes a good 50 miles to get the computer to remember what it is supposed to do.
Glad it seems to be running good now though. ![[patriot]](graemlins/patriot.gif)
Posts: 7282 | Registered: Apr 2003
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92stangLX
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Member # 3252
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How much timing are u running? What mods do you have (if any)?
Posts: 5302 | From: San Francisco | Registered: Sep 2003
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1bdpone
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Member # 6708
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posted
I am running stock 10 degree timing and pretty much stock on the motor. It does have a cold air intake, shorty headers and magnaflow exhaust. 9mm spark plug wires, new ICM and map sensor (new as in the last 6 months). I spoke with a Ford mechanic and he said it is not unusual for the computer to have to re-adjust from being up in the high altitude.
As far as tuning goes (uncle bill)... An out of tune 5.0 Mustang is not going to get over 28mpg driving at over 75mph through thr mountains.
The good thing is my Mustang is running just fine and no pinging now.
[ June 25, 2007, 09:18 PM: Message edited by: 1bdpone ]
Posts: 182 | From: Tri Valley | Registered: Apr 2006
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uncle bill
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Member # 3953
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sorry pone, glad you got it figured out
Posts: 415 | From: antioch | Registered: Dec 2003
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1bdpone
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Member # 6708
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I am just glad the Mustang is running fine once again. a ping in the motor is very frustrating.....
Posts: 182 | From: Tri Valley | Registered: Apr 2006
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