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Still getting this weird hesitation..
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Posted by Goblin [Email] (#2224) [Profile/Gallery] (more from Goblin) on Sun, 30 Jan 2022 18:06:14 Share Post by Email
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So I took all the turbo piping off rechecked every single clamp, everything seemed to be okay. It does this weird hesitation thing in between gear shifts.The car is a five speed. So there is an air fuel ratio gauge in the car. So just for instance I'm getting on the gas say 25% throttle and I shift into fourth gear the air fuel ratio gauge drops down into lean for a split second and then goes back to normal. I don't ever really remember the car doing that ,I've had this set up in the car for the last 60,000 miles. And it's never done this particular hesitation . In the beginning of this build I had a weird start issue where I had to push the gas pedal down for a second or two and then let it off in order to get the car to start.When I changed all four of the fuel injectors to another set that completely went away so I'm assuming something was wrong with one of those injectors but I don't know that. So back to the hesitation problem. It hasn't gotten any worse but it happens in between gear shifts and it seems to happen right at the point when the motor is in between vacuum and boost so basically right at zero pressure in either direction. Very odd. I have no check engine light. With the air fuel ratio gauge showing lean for a split second I would just assume that is vacuum and the car's not actually running lean it's just pulling vacuum because we're in between gear shifts and that would be normal.I changed the DIC and that did nothing. The spark plugs show a very good running motor. It really seems like a vacuum leak but I've sprayed the whole motor down with carburetor cleaner I have found no leaks anywhere and if I would have a leak I wouldn't be hitting 25 lb of boost, I did a really hard pull in 5th gear up to 140 and it stayed pegged at 25 lb I don't really want to just start throwing parts at it but if anybody else has got any other ideas that's probably what I'm going to do. Figured I would throw a new map sensor on it a new intake charge temperature sensor that is in the intake pipe and throw on a new throttle position sensor do those one at a time and see if any one of those makes this go away. And the majority of the time when I get this hesitation it's not even driving hard it's actually driving in city traffic driving normal so it's not really under boost and then shifting it's actually probably more like it's under vacuum and then I shift then there's more vacuum then I get the hesitation until I get say one pound of boost and then it clears up.and when I do a third fourth and 5th gear pull it doesn't do it at all because I'm 100% on the throttle and never really give it a chance to get into vacuum so it's always in boost. Any help would be appreciated I know it's a lot to read and take in. I do have a catch can and it does not collect a lot of oil so I do not have a lot of blow by. The rings have about 25,000 miles on them and the bearings have the same mileage as the rings so the motor is fairly new completely put together with all new gaskets and everything so everything is relatively new .I wonder if I just have a very small vacuum leak somewhere causing this and I just can't find it. I've taken the air idle control hoses off and made sure those brass fittings were nice and snug. Thanks

->Posting last edited on Tue, 1 Feb 2022 16:24:43.


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