Martingdavies1985 Posted March 20, 2016 Share Posted March 20, 2016 So few weeks about my gt turbo started juddering at low revs but fine once going would occasionally do it when going around roundabouts aswell, now a new problem has arisen when pulling off the engine seems laggy under 3k then above that it hurtles forward with a slight spurt of life. I'm thinking map sensor is on way out, anyone experienced any similar symptoms? Quote Link to post Share on other sites
aleximport25 Posted March 20, 2016 Share Posted March 20, 2016 My old external wastegate was really lumpy under boost but fine when in her stride, swapped it out and she's smooth as now. Possibly weak actuator or ewg Quote Link to post Share on other sites
Martingdavies1985 Posted March 20, 2016 Author Share Posted March 20, 2016 It feels electrical mate, think a trip to td next week may be in order tbh Quote Link to post Share on other sites
Martingdavies1985 Posted March 20, 2016 Author Share Posted March 20, 2016 Would a cracked manifold cause problems? Quote Link to post Share on other sites
richardc9052 Posted March 20, 2016 Share Posted March 20, 2016 Change the distributor. sometimes the cam sensor in them fail. You can keep your cap and rotor, its the main unit that needs changing if it is. Best to try one off another gt to test first. Quote Link to post Share on other sites
Martingdavies1985 Posted March 20, 2016 Author Share Posted March 20, 2016 I've just found two massive cracks on the exhaust mani could this cause it to run bad & can I cause problems like jerking etc? Quote Link to post Share on other sites
richardc9052 Posted March 20, 2016 Share Posted March 20, 2016 No. It would cause lag and bad MPG but not what you are describing Quote Link to post Share on other sites
Martingdavies1985 Posted March 20, 2016 Author Share Posted March 20, 2016 I've got a funny feeling it's map sensor for some reason not sure why, is there any way tuning developments would be able to find out on a dyno? Or is it simply a case of trying loads of different things? Hasn't long had ignition overhaul at td see Quote Link to post Share on other sites
sosolid Posted March 21, 2016 Share Posted March 21, 2016 lambda sensor. same problem i had. check it out Quote Link to post Share on other sites
richardc9052 Posted March 23, 2016 Share Posted March 23, 2016 ignition overhaul would not have included main distributor unit.. Quote Link to post Share on other sites
gibby1980 Posted April 2, 2016 Share Posted April 2, 2016 Unplug your TPS and test drive the car. Classic signs of a bad TPS imo. Quote Link to post Share on other sites
adzy Posted April 2, 2016 Share Posted April 2, 2016 Change your spark plugs? I has similar issues, usually happened at low revs when the car was just warming up. Changed back to copper plugs and it hasn't happened since so I'm hoping that was the cause. Quote Link to post Share on other sites
ChaseWheatley Posted June 24, 2016 Share Posted June 24, 2016 My car is doing the exact same thing now it has new plugs, leads, cap still have not worked out what's going on Quote Link to post Share on other sites
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