Pinging - Please Help!
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Pinging - Please Help!
'88 302 EFI AOD just turned 100k miles
Recently started expeiencing a pining and lack of performance around 1800-2200 RPM range. Usually happens after warm up. After warm up the lack of performance can happen around town (taking off from stoplight usually) and highway.
Changed or did the following
TPS
EGR
EVP
O2
PCV
Cleaned Throttle Body
Fuel Filter
Cap/Rotors/Wires (Accel)
AC Delco Rapid Fire Plugs
Premium Gas
When I checked the TPS (old one by back probing the Black and Orange wires), voltage was reading 4.8 all of the time, So I changed it. Well I replaced it and checked the voltage again and it still reads 4.8 . Pulled the codes yesterday and with the new TPS I had a 63 code.
If I wanted to check the vacuum what is the best way to do so?
Any ideas on what else I can do concerning the pinging/lack of performance and what I might be doing wrong with the TPS would be appreciated.
Thought about other things to change but I do not want to just throw things at it. Also do not want to take it to dealership - bu tit lookslike that is waht it is coming to.
Scott
Recently started expeiencing a pining and lack of performance around 1800-2200 RPM range. Usually happens after warm up. After warm up the lack of performance can happen around town (taking off from stoplight usually) and highway.
Changed or did the following
TPS
EGR
EVP
O2
PCV
Cleaned Throttle Body
Fuel Filter
Cap/Rotors/Wires (Accel)
AC Delco Rapid Fire Plugs
Premium Gas
When I checked the TPS (old one by back probing the Black and Orange wires), voltage was reading 4.8 all of the time, So I changed it. Well I replaced it and checked the voltage again and it still reads 4.8 . Pulled the codes yesterday and with the new TPS I had a 63 code.
If I wanted to check the vacuum what is the best way to do so?
Any ideas on what else I can do concerning the pinging/lack of performance and what I might be doing wrong with the TPS would be appreciated.
Thought about other things to change but I do not want to just throw things at it. Also do not want to take it to dealership - bu tit lookslike that is waht it is coming to.
Scott
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Pinging - Please Help!
When I replaced the TPS I simply had it so the shaftblade was in the tangs and then turned it clockwise to the marked position that I had for the original. I marked reference points for where the old one's mounting position was. The only thing I can think is that I may be backprobing the wrong wires. If I remeber correctly I probed the Black/white and the orange/something. I got that from the haynes manual and the diagram they provided. In other posts the method said the B/W (-) and the Grn/Lt Grn (+). I will try it when I get home.
Does that sound right? Thought about testing the MAP and the IAC as well. See if any of those are off?
Other question - When I pull the vacum line from the upper intake manifold the idle increases. IS this correct. I read some place that it should stumble and possibly stall?
Thanks for the help.
Does that sound right? Thought about testing the MAP and the IAC as well. See if any of those are off?
Other question - When I pull the vacum line from the upper intake manifold the idle increases. IS this correct. I read some place that it should stumble and possibly stall?
Thanks for the help.
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From: Independence, MO
Pinging - Please Help!
no a open vacum leak should make idle increase,.
TP adjustment: connect the neg. prob of the voltmeter to the black/white wire, and connect the positive prob of the volt meter to the green/light green wire, loosen the TP screws, switch the key on, dont crank the motor, adjust the TP sensor to read 1.0 volts, retighten the screws and recheck the voltage. This is directly from the haynes manual. DW
TP adjustment: connect the neg. prob of the voltmeter to the black/white wire, and connect the positive prob of the volt meter to the green/light green wire, loosen the TP screws, switch the key on, dont crank the motor, adjust the TP sensor to read 1.0 volts, retighten the screws and recheck the voltage. This is directly from the haynes manual. DW
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Pinging - Please Help!
Appreciate all of the help so far. This problem is starting to bug me.
I will test the TPS based on the info you gave.
So the engine idle should drop when I disconnect the vacum line at the upper intake maifold.
If that is the case what would cause the idle to increase in RPM?
I will test the TPS based on the info you gave.
So the engine idle should drop when I disconnect the vacum line at the upper intake maifold.
If that is the case what would cause the idle to increase in RPM?
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Posting Guru
Joined: Jul 2003
Posts: 1,486
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From: Independence, MO
Pinging - Please Help!
no no no no, u misunderstood, it will increase if you have a vac leak, it sucks in air leans out the fuel mixture and the rpms go's up! 
DW
DW
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Pinging - Please Help!
Tested the TPS and it is fine.
Checked IAC and it tested fine.
Checked the MAP and I could not get a good voltage reading. Not sure if it is the frequency type or the voltage type? If anyone has checked the MAP, let me know how you did it so that I make sure I am doing it right.
Checked the vacuum to the MAP by pulling the line from it at idle. The engine would almost die and then come back but finally dies. Good or bad?
Checked the vacuum lines and they looked good. Sprayed WD40 around them and the idle did not change.
Took the truck for a spin after all of this and no codes in the computer
Checked IAC and it tested fine.
Checked the MAP and I could not get a good voltage reading. Not sure if it is the frequency type or the voltage type? If anyone has checked the MAP, let me know how you did it so that I make sure I am doing it right.
Checked the vacuum to the MAP by pulling the line from it at idle. The engine would almost die and then come back but finally dies. Good or bad?
Checked the vacuum lines and they looked good. Sprayed WD40 around them and the idle did not change.
Took the truck for a spin after all of this and no codes in the computer