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bozy6666
New User
Mar 24, 2012, 5:14 AM
Post #1 of 6
(2283 views)
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Hi all, i have a 1998 R reg Corsa 1.0 L petrol that seem to hesitate when you put your oot down, if i rev the car even standing still it seems stop reving for a second or two then will suddenly pick up and increase revs
i have had the EGR changes and new plugs but am at a loss there was a code once with referece to the O2 sensor but that was cleared and has not returned
any advice will be much appreciated
Thanks
Shaun
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 24, 2012, 7:42 AM
Post #2 of 6
(2245 views)
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Re: hesitant Corsa
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We don't have that car here in the states, so detailed advice is going to be limited. I am sure your vehicle has a throttle position sensor. Do a throttle position sensor sweep test by back probing the signal wire in the TPS connector and connect a volt meter to the back probe. Most TPS voltages range from .5VDC -4.5VDC depending on the position of the throttle. Check for any dead spots while slowly opening and closing the throttle.
Watch this video for more information:
http://www.youtube.com/watch?v=8KfKfImoIXg
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 24, 2012, 7:47 AM)
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bozy6666
New User
Mar 24, 2012, 11:41 AM
Post #3 of 6
(2226 views)
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Re: hesitant Corsa
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Hi i have checked the MAF voltage references and get an idle value of 1.5v which is correct but when i accelerate i only get v2.3 instead of 4.2v
also i did a check of the TPS and noticed a flat spot at low throttle
so am not sure what to go for ? any ideas
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Discretesignals
Ultimate Carjunky
/ Moderator
Mar 24, 2012, 11:53 AM
Post #4 of 6
(2225 views)
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Re: hesitant Corsa
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If you found a dead spot during the TPS sweep check, probably wouldn't be a bad idea to replace your TPS sensor. Some sensors are adjustable, so you'll have to take note of what the voltage is coming out of the old TPS sensor with the throttle closed and set your new TPS to that voltage. If the TPS isn't adjustable, that means the computer can auto zero the TPS voltage when you turn the ignition on requiring no manual adjustments of the TPS.
Start with resolving your TPS problem first, then check your MAF output reading. A dead spot in the TPS can cause your MAF sensor output reading to go low during the stumble.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Mar 24, 2012, 11:54 AM)
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bozy6666
New User
Mar 24, 2012, 12:42 PM
Post #5 of 6
(2213 views)
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Re: hesitant Corsa
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Thanks for the help it is greatly appreciated
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bozy6666
New User
Mar 29, 2012, 7:36 AM
Post #6 of 6
(2165 views)
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Re: hesitant Corsa
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Hi all, i changed the MAF sensor, CTS and the TPS, cleaned the throttle body took it out for a test and all seemed fine it has been driving well but now it seems to be struggling again and lumpy erratic idling
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