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Unread 01-04-2010, 08:46 PM   #1
joe's_yj
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1993 YJ Wrangler 
 
Join Date: Mar 2007
Location: Leesburg,VA
Posts: 1,418
1990 chevy 3500 engine troubles

I recently bought a 1990 chevy 3500 with a 454 7.4l motor and auto trans. 4wd. now i bought it with these problems hoping i can fix them. i got the codes out, its
code 43 knock sensor
or electronic spark control circuit fault

The symptoms are, the truck doesnt accelerate worth a damn, has terriable gas mileage( i know its a 454) when i shift from park to a gear, the idle drops to almost stalling and then picks back up. i also have a service engine soon light

Would replacing the knock sensor fix this? i was told that code will retard the timing. This could be the cause of all my problems right? thanks

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Quote:
Originally Posted by tawdr77 View Post
The cheapest way to get a significant power increase over a stock 2.5l, would be to pull it out and put in a 5hp briggs & stratton engine.
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Unread 01-05-2010, 01:14 AM   #2
jumbojeepman
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1976 CJ7 
 
Join Date: Sep 2008
Location: Greenville, NC
Posts: 1,099
Knock sensor will retard the timing and cause the symptoms you are experiencing. Could be the sensor, there's a checklist to run through before you just throw a new sensor on it, though (basically see if it's getting power, the right resistance, etc.)
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Unread 01-05-2010, 08:04 PM   #3
joe's_yj
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1993 YJ Wrangler 
 
Join Date: Mar 2007
Location: Leesburg,VA
Posts: 1,418
i got a new sensor, but i cant get the old one off. ugh always somethin. hopefully i can get it tomorrow
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my build up http://jeepforum.com/forum/showthread.php?t=427353
Quote:
Originally Posted by tawdr77 View Post
The cheapest way to get a significant power increase over a stock 2.5l, would be to pull it out and put in a 5hp briggs & stratton engine.
joe's_yj is offline   Reply With Quote Quick reply to this message
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