problem : sputtering when i drive normal.
10-01-04, 01:35 AM
#1
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problem : sputtering when i drive normal.
its not a really noticeable sputtering problem. It mainly occurs when i am driving around 45-75 mphs for a while. Lets say i am driving in the high way and im going 65, i will be pressing the accelerator ever so slightly, enough to keep the car at 65 mph the entire time, and it will begin to sputter a little bit. I searched and found problems that were more severe then mine and not under the same circumstances as mine. Anyone have any clue? thanks much guys.
10-01-04, 10:42 AM
#2
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I'll bet your short range TPS is about worn out.
Using test lights or voltage at idle readings will get your idle setting perfect, but you could still have a worn out TPS resistor.
-The golden test:
Unplug the TPS connector.
Clip a cheap analog (needle type) VOM on the orange & black pins.
Set it to the 1K scale.
Hold off the throttle & work the short range TPS plunger in & out.
You should see a smooth sweep from ~0 to ~5K ohms.
Any bad spots or drop outs in the stroke - it's bad & will give fuel cuts at part throttle.
(Before you toss it, try spray contact cleaner between the sleeve & plunger.)
- Then set it:
Find the fast idle (warm-up) cam & back it off so the throttle sits on the hard idle stop.
Adjust the setting to 1K ohms.
While holding off the fast idle cam, open & close the throttle a few times to see that the 1K setting repeats.
Using test lights or voltage at idle readings will get your idle setting perfect, but you could still have a worn out TPS resistor.
-The golden test:
Unplug the TPS connector.
Clip a cheap analog (needle type) VOM on the orange & black pins.
Set it to the 1K scale.
Hold off the throttle & work the short range TPS plunger in & out.
You should see a smooth sweep from ~0 to ~5K ohms.
Any bad spots or drop outs in the stroke - it's bad & will give fuel cuts at part throttle.
(Before you toss it, try spray contact cleaner between the sleeve & plunger.)
- Then set it:
Find the fast idle (warm-up) cam & back it off so the throttle sits on the hard idle stop.
Adjust the setting to 1K ohms.
While holding off the fast idle cam, open & close the throttle a few times to see that the 1K setting repeats.
10-01-04, 11:55 AM
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I agree sounds like TPS problem, and just went through this in my car same description. Turned out "for me" that the wire was cracked and shorting in the harness. I had checked adjusted replaced TPS 2 times during the summer. Thought I had it figured then it would come back again. Then thought no it couldnt be TPS as it kept coming back even after replacing.
Finally stripped back harness and foun the TPS wire had hardened and cracked in the harness. Re wired it and FINALLY problem solved.
THink this is a good heads up for others that have gremlins. The wires in the haarness are getting pretty old now and brittle. Something to ponder when your car acts up...
Finally stripped back harness and foun the TPS wire had hardened and cracked in the harness. Re wired it and FINALLY problem solved.
THink this is a good heads up for others that have gremlins. The wires in the haarness are getting pretty old now and brittle. Something to ponder when your car acts up...
10-01-04, 12:23 PM
#4
Lives on the Forum
And if it's not TPS, you're in the same boat as me, lol...
And I've checked about 75% of the **** on the car now...AArgghh
Does it do it more on bumps, or right after bumps?
You can also check your TPS while driving, just "backprobe" the positive meter lead (or a small piece of wire connected to the lead) in the correct ECU pin, negative lead on a ground, and you're off. Any TPS malfunctions will show up as meter needle dips while driving, and if it happens to dip while the car is acting up, bingo, you got here. This will also check for the wire "gremlins" as Tiers alluded to, because you'll be checking the entire circuit this way...
If it's not your TPS, leave the carpet pulled back and check everything else now, lol...
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/troubleshooting-your-car-ecu-340578/
And I've checked about 75% of the **** on the car now...AArgghh
Does it do it more on bumps, or right after bumps?
You can also check your TPS while driving, just "backprobe" the positive meter lead (or a small piece of wire connected to the lead) in the correct ECU pin, negative lead on a ground, and you're off. Any TPS malfunctions will show up as meter needle dips while driving, and if it happens to dip while the car is acting up, bingo, you got here. This will also check for the wire "gremlins" as Tiers alluded to, because you'll be checking the entire circuit this way...
If it's not your TPS, leave the carpet pulled back and check everything else now, lol...
https://www.rx7club.com/2nd-generation-specific-1986-1992-17/troubleshooting-your-car-ecu-340578/
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