steveo3002 Posted June 20, 2017 Share Posted June 20, 2017 2004 petty 1600 focus , its all serviced up to date and no fault code lights or codes when accelerating from low revs its got a stumble /lumpy flat spots , does it regardless of foot flat to floor or progressive pedalage any ideas ? feels like in the old days when a good thrash would clear it but not on this one Link to comment Share on other sites More sharing options...
oldcars Posted June 20, 2017 Share Posted June 20, 2017 Airflow meter? Kia was like this, but it did throw the check light up and give a fault code, not a MAF code but a code. Link to comment Share on other sites More sharing options...
Stanky Posted June 20, 2017 Share Posted June 20, 2017 +1 on the MAF - if you have a code reader check it for fault codes and potentially disconnect the MAF - resetting it to the 'default' map, though this will put the EML on I suspect. See if it still bogs down with the stock map. if you can get to the MAF easily give it a blast with contact cleaner or carb cleaner (I think this is probably a bit harsh, but worked on the Kia we used to have) and see if that perks it up at all. I suspect a secondhand MAF for a 1600cc Focus won't cost very much, a new one for a 2004 Kia Rio was £400 from ECP so we kept it going with regular doses of carb cleaner and then sold it and made it someone else's problem. Link to comment Share on other sites More sharing options...
sierraman Posted June 20, 2017 Share Posted June 20, 2017 Possibly the ISCV, but just as likely candidate is a vacuum leak from one of the hoses. Check for perishing. Link to comment Share on other sites More sharing options...
steveo3002 Posted June 20, 2017 Author Share Posted June 20, 2017 its had isv and hoses chasing another problem pretty sure this one doesnt have a maf Link to comment Share on other sites More sharing options...
The Moog Posted June 20, 2017 Share Posted June 20, 2017 Have you got Aircon? Try turning it off The puma pulses when Aircon is switched on. Dunno why Link to comment Share on other sites More sharing options...
steveo3002 Posted June 20, 2017 Author Share Posted June 20, 2017 does have a/c ...might be slightly worse with it on but does the same on or off would a throttle pos sender be likley? move pedal and engine takes a while to catch on whats happening? Link to comment Share on other sites More sharing options...
twosmoke300 Posted June 20, 2017 Share Posted June 20, 2017 How many miles - oxygen sensors on these for really lazy but don't show a fault code . Ideally you need to monitor the voltage on live data with a scan tool or even better a scope . It should go from .9v ish down to .1v and back about once a second . If it's taking two or three seconds then the sensor is toast . This assumes it's all up to working temp btw Link to comment Share on other sites More sharing options...
twosmoke300 Posted June 20, 2017 Share Posted June 20, 2017 Oh and some have a pipe with a t piece under the manifold that splits . It comes from Ford complete with pcv valve ( which fail sometimes) for about 25 quid iirc Link to comment Share on other sites More sharing options...
steveo3002 Posted June 20, 2017 Author Share Posted June 20, 2017 its had the pipe and valve already will look at the o2 readings , its done around 150k ish Link to comment Share on other sites More sharing options...
steveo3002 Posted June 23, 2017 Author Share Posted June 23, 2017 o2 readings seem to check out...cycling up and down every second any ideas folks? Link to comment Share on other sites More sharing options...
cpjitservices Posted June 23, 2017 Share Posted June 23, 2017 Has it got an EGR Valve ? Link to comment Share on other sites More sharing options...
steveo3002 Posted June 23, 2017 Author Share Posted June 23, 2017 Has it got an EGR Valve ?honestly ..i dunno lol any ideas folks Link to comment Share on other sites More sharing options...
egg Posted June 23, 2017 Share Posted June 23, 2017 New spark plugs solved this issue on my Fusion. Link to comment Share on other sites More sharing options...
egg Posted June 23, 2017 Share Posted June 23, 2017 Have you got Aircon? Try turning it offThe puma pulses when Aircon is switched on. Dunno whyI think the engine revs are increased slightly with Aircon on? Link to comment Share on other sites More sharing options...
steveo3002 Posted June 23, 2017 Author Share Posted June 23, 2017 New spark plugs solved this issue on my Fusion.what brand did you get Link to comment Share on other sites More sharing options...
egg Posted June 23, 2017 Share Posted June 23, 2017 Just fairly cheap DENSO. Link to comment Share on other sites More sharing options...
egg Posted June 23, 2017 Share Posted June 23, 2017 How many miles - oxygen sensors on these for really lazy but don't show a fault code . Ideally you need to monitor the voltage on live data with a scan tool or even better a scope . It should go from .9v ish down to .1v and back about once a second . If it's taking two or three seconds then the sensor is toast . This assumes it's all up to working temp btw I just tried this test on my 1.6 2002 Fusion for my own interest and to hopefully help the OP. This is what my oscilloscope looks like (up to temp). SiC 1 Link to comment Share on other sites More sharing options...
steveo3002 Posted June 23, 2017 Author Share Posted June 23, 2017 thanks for that Link to comment Share on other sites More sharing options...
egg Posted June 23, 2017 Share Posted June 23, 2017 thanks for that No problem, I'm not sure if I know if that means it has had it or not! As a comparison mine has done 110,500 miles Link to comment Share on other sites More sharing options...
steveo3002 Posted June 23, 2017 Author Share Posted June 23, 2017 any ideas how you check the tps ? Link to comment Share on other sites More sharing options...
egg Posted June 23, 2017 Share Posted June 23, 2017 any ideas how you check the tps ? I think it will come up as a fault code if there is a problem? There are probably some parameters to check, but again I'm not sure how to interpret! Link to comment Share on other sites More sharing options...
steveo3002 Posted June 23, 2017 Author Share Posted June 23, 2017 yeah youd think if some fault there would be a code come up , really doesnt drive very well at all but relucatant to start throwing random parts at it Link to comment Share on other sites More sharing options...
mrbenn Posted June 23, 2017 Share Posted June 23, 2017 I'd be putting genuine Ford plugs/leads/coil on it with these symptoms and no fault code. Link to comment Share on other sites More sharing options...
steveo3002 Posted June 23, 2017 Author Share Posted June 23, 2017 yeah coil and leads did pass my mind as internet says they fail often , but wouldnt it register a misfire on the log? Link to comment Share on other sites More sharing options...
SiC Posted June 23, 2017 Share Posted June 23, 2017 No, not always. Some have to be misfiring on a cylinder almost constantly for it to trigger. steveo3002 1 Link to comment Share on other sites More sharing options...
Guest Hooli Posted June 23, 2017 Share Posted June 23, 2017 I think the engine revs are increased slightly with Aircon on? You can feel the drag of the aircon clutch kicking in & out on some engines if it's a bit slow to react & correct it's revs. Link to comment Share on other sites More sharing options...
The Moog Posted June 24, 2017 Share Posted June 24, 2017 Puma feels like someone is pulling on the handbrake as you drive. Missus Moogs focus you can definitely feel it kick in and out. Link to comment Share on other sites More sharing options...
Guest Hooli Posted June 24, 2017 Share Posted June 24, 2017 Partly seized compressor? that'd add a lot of drag as it kicks in. Link to comment Share on other sites More sharing options...
Twiggy Posted June 24, 2017 Share Posted June 24, 2017 I had exactly the same problem with mine, a Focus C-max 1.6 Zetec, same engine I think. replaced the coil pack, no change, the plugs, no change, injector cleaner and Cataclean, no change. Then the plug leads - problem solved. Once off I checked the leads with a multi meter and found one totally dead, the other three giving readings on 20k ohms from around 4 to around 17 depending on the length. I got them through my local garage who warned me that the were extortionately expensive, but said OEM from Ford was the only way to go. I suppose it would have made more sense to have checked them with a multi before buying a new set. So, take them all off and check them first........... hope it works. Link to comment Share on other sites More sharing options...
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