throttle issue
Thread Starter
8th Gear
Joined: Oct 2014
Posts: 8
Likes: 0
throttle issue
I have an 85 with a throttle problem. When I am driving if I push the gas in more than an inch or two then it will bogg down. If I only give it a little bit then it will go great just can't push the gas in much. I change the tps and the IAC but I set the throttle fine and I set the tps to .5 volts with ignition on but not running. Thanks in advance for any help
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
I have an 85 with a throttle problem. When I am driving if I push the gas in more than an inch or two then it will bogg down. If I only give it a little bit then it will go great just can't push the gas in much. I change the tps and the IAC but I set the throttle fine and I set the tps to .5 volts with ignition on but not running. Thanks in advance for any help
Check your fuel pressure while driving
Safety Car
Joined: Aug 2009
Posts: 3,751
Likes: 276
From: Melbourne, Victoria, Australia
I have an 85 with a throttle problem. When I am driving if I push the gas in more than an inch or two then it will bogg down. If I only give it a little bit then it will go great just can't push the gas in much. I change the tps and the IAC but I set the throttle fine and I set the tps to .5 volts with ignition on but not running. Thanks in advance for any help
Check for any codes, the acld connector under the dash connect a paperclip to the top right hand terminals and turn ignition on.
Count the number of times the check engine light flashes, you can google code numbers.
Check the tps shows 0.54 volts dc with ignition on, then check the voltage goes up to around 4 volts dc.
If that is good check the timing, retarded ignition can give similar effects. Check the Mass airflow sensor, connector good no corrosion?
is the duct to engine ok no cracks and clamps tight?
I always like to disconnect the battery (or ecm connector near the battery) resetting codes and anything the ecm has been trying to counteract. It can get itself in knots and i find the car runs better (after ten or twenty mins relearning)
The TPS and Maf sensor are most important to calculate fuel delivery.
The fuel pressure should be around 35-38 psi (the 85 uses 24lb injectors and i found my fuel pressure around 32-36 standard.
Does it have the problem when in park and reving it without driving?
could be fuel related so check the pressure and timing.
REMEMBER THE HARMONIC BALLANCER CAN SLIP do not trust it make sure you take no.1 spark plug out and make sure it is at top dead center when on the timing mark.
Good luck
