Swisstony Posted October 14, 2021 Share Posted October 14, 2021 Hi folks, first day here and already a question 😅 On my 57 plate Zetec Climate 1.8, i have had a constant issue with a flat spot/ hesitation from just above tickover revs. Has been greatly reduced with changing the egr, plugs, air filter and split pipe from air filter housing to engine (throttle bodies?) but still appears then disappears randomly. By the way, the new air filter I had fitted turned out to be restricting the airflow which did improve the response once changed. If I start the car from cold and it stalls (which it usually does) after restarting, it runs quite well, with minimal stuttering. However if I keep the car going from a cold start there is a lot of hesitation/ stuttering and to put it bluntly it drives like a bag of s@£$e to the point where I have to turn off and restart to get a semblance of civility from the bugger. Don't know if it makes a difference, but the Mrs. couldn't get the car restarted after going to the shops (after it was running progressively worse with chugging etc.) but I just put my foot to the floor while cranking it over and it fired up straight away. Just like the old carb fed cars of yesteryear. 😐 Also, if the car is ticking over and I try to blip the throttle , it sort of chokes then the revs rise. This all suggests fuel starvation, but also possible over fueling to me but am at a loss where to start. Only idea I have is something to do with the cold start/ idle control? but, hopefully someone can shed light. Sorry for the length of this post but I always think a lot of information is better than sod all. 👍 Quote Link to comment Share on other sites More sharing options...
F0CUE Posted October 14, 2021 Share Posted October 14, 2021 It would be easier to see if any codes are logged to track down what is happening. Get a code reader. An ELM327 from Tunnelrat and ForScan to match which version you choose. It will save throwing parts at the car and possibly track down what is actually wrong. 1 Quote Link to comment Share on other sites More sharing options...
unofix Posted October 14, 2021 Share Posted October 14, 2021 As @F0CUE has said use Forscan to read any DTC's that might be logged. It sounds like it could be a problem with the high pressure fuel pump. With Forscan you can use live data to monitor the pressure of the fuel rail in real time. Quote Link to comment Share on other sites More sharing options...
Swisstony Posted October 15, 2021 Author Share Posted October 15, 2021 Thanks for the suggestions guys. My OBD scanner showed up the egr as n/w. There is an audible whining that decreases and then stops when the car turns off which I reckoned was the fuel pump, but it did surprise me as to how busy it sounded. Could that be the issue? Tbh the parts have been put on the car as I intended to keep it a while but now the Mrs won’t use it and she has annexed my Mondeo 😐 so unless I cure the issue it is going, which is a shame as it is a genuine 68k, but I want my Mondeo back. Quote Link to comment Share on other sites More sharing options...
DaveT70 Posted October 15, 2021 Share Posted October 15, 2021 59 minutes ago, Swisstony said: My OBD scanner showed up the egr as n/w. Have you changed the EGR? If not then that's the first thing you must do. 59 minutes ago, Swisstony said: There is an audible whining that decreases and then stops when the car turns off which I reckoned was the fuel pump, but it did surprise me as to how busy it sounded. Could that be the issue? I seem to remember mine made that noise after shutdown As mentioned, get a good quality ELM327 lead and Forscan and do a current read of faults Quote Link to comment Share on other sites More sharing options...
Swisstony Posted October 15, 2021 Author Share Posted October 15, 2021 1 hour ago, DaveT70 said: Have you changed the EGR? If not then that's the first thing you must do. AHEM 😏 17 hours ago, Swisstony said: Has been greatly reduced with changing the egr, plugs, air filter and split pipe from air filter housing to engine (throttle bodies?) 1 Quote Link to comment Share on other sites More sharing options...
DaveT70 Posted October 15, 2021 Share Posted October 15, 2021 1 hour ago, Swisstony said: Has been greatly reduced with changing the egr, plugs, air filter and split pipe from air filter housing to engine (throttle bodies?) Sorry, missed that. Have you tried cleaning and resetting the throttle body? 1 Quote Link to comment Share on other sites More sharing options...
Swisstony Posted October 15, 2021 Author Share Posted October 15, 2021 59 minutes ago, DaveT70 said: Sorry, missed that. Have you tried cleaning and resetting the throttle body? Figured you had that's I why I replied (unusually for me) so politely 🙂 Have ordered the Tunnelrat connector to take a peek at the fuel pump goings on etc. I assume I can find the procedure for the throttle bodies in the help files? Quote Link to comment Share on other sites More sharing options...
F0CUE Posted October 15, 2021 Share Posted October 15, 2021 2 minutes ago, Swisstony said: Figured you had that's I why I replied (unusually for me) so politely 🙂 Have ordered the Tunnelrat connector to take a peek at the fuel pump goings on etc. I assume I can find the procedure for the throttle bodies in the help files? Some info Here 1 Quote Link to comment Share on other sites More sharing options...
Swisstony Posted October 15, 2021 Author Share Posted October 15, 2021 3 minutes ago, F0CUE said: Some info Here Cheers for that. As an aside, is there a cold start sensor or would that be controlled by the throttle bodies? Quote Link to comment Share on other sites More sharing options...
F0CUE Posted October 15, 2021 Share Posted October 15, 2021 17 minutes ago, Swisstony said: Cheers for that. As an aside, is there a cold start sensor or would that be controlled by the throttle bodies? Not entirely sure on that but I'm sure somebody else can chime in. Quote Link to comment Share on other sites More sharing options...
TomsFocus Posted October 15, 2021 Share Posted October 15, 2021 The PCM uses the coolant temp as well as air intake temp & ambient air temp to determine the correct temperature mapping. There is no specific cold start sensor. 1 Quote Link to comment Share on other sites More sharing options...
Swisstony Posted October 15, 2021 Author Share Posted October 15, 2021 3 hours ago, TomsFocus said: The PCM uses the coolant temp as well as air intake temp & ambient air temp to determine the correct temperature mapping. There is no specific cold start sensor. Cheers Tom 👍 Quote Link to comment Share on other sites More sharing options...
DaveT70 Posted October 18, 2021 Share Posted October 18, 2021 On 10/15/2021 at 7:42 PM, TomsFocus said: The PCM uses the coolant temp as well as air intake temp & ambient air temp to determine the correct temperature mapping. There is no specific cold start sensor. Ah, yes, that's a point. Is your ambient temperature sensor working ok? These can cause running issues Quote Link to comment Share on other sites More sharing options...
Swisstony Posted October 18, 2021 Author Share Posted October 18, 2021 3 hours ago, DaveT70 said: Ah, yes, that's a point. Is your ambient temperature sensor working ok? These can cause running issues Where would I find that? Quote Link to comment Share on other sites More sharing options...
DaveT70 Posted October 18, 2021 Share Posted October 18, 2021 11 minutes ago, Swisstony said: Where would I find that? Have you got temperature display on the cluster? Quote Link to comment Share on other sites More sharing options...
Swisstony Posted October 18, 2021 Author Share Posted October 18, 2021 43 minutes ago, DaveT70 said: Have you got temperature display on the cluster? YUP Quote Link to comment Share on other sites More sharing options...
DaveT70 Posted October 18, 2021 Share Posted October 18, 2021 Ok, and it seems to be working OK, so forget that then Quote Link to comment Share on other sites More sharing options...
Swisstony Posted October 18, 2021 Author Share Posted October 18, 2021 1 hour ago, DaveT70 said: Ok, and it seems to be working OK, so forget that then Ah well.....my OBD from thingyrat arrived today so I can take a peek tomorrow. Appreciate the suggestions though 👍 Quote Link to comment Share on other sites More sharing options...
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