Hey people,<br><br>Just as soon as I've got rid of one car and got another, I've got a problem with it again!<br><br>It's a mk4 Golf, 2001 1.6L 16v. 110K on the clock<br><br>I bought it from a dealer just over a week ago and it was taken in part exchange so I got a fairly good deal on it. <br><br>It looked in decent nick and drove quite nicely on the test drive, it has got all matching Firestone tyres throughout too, even the spare so I thought this was a good inclination that the previous two keeper had looked after it, along with all the service history.<br><br>Anyway, when I got the car I gave it a bit of a service like I always do when I get a new motor, the oil had just been changed on so I put a new air filter in, replaced the spark plugs, put some oil additive in along with some fuel additive to help clean the old girl out.<br><br>I also took the throttle body off to give it a good clean because the revs were jumping up and down a touch when idling. done this in my old mk3 Golf and it sorted it out.<br>The underneath of the throttle body was absolutely caked in ****, a black greasy soot, I've never actually seen anything like it and took a good while to clean it out. inside the intake manifold looked like it had a lot of crud in there too.<br><br>Anyway, I cleaned the throttle body and what I could of the intake (without stripping it down) and put it all back together.<br><br>The revs are still bouncing up and down on idle and it seems to me like it doesn't have as much power as it should, it also seems like the speedo is out. I've tested it against a satnav and two phones which were all reading the same speed. so when I was doing 90 in my car (which really didn't feel like 90) it was actually 70mph. quite a difference!<br><br>I took the engine cover off of the top of the engine which houses the airfilter and has a breather pipe thing going into the box too.<br><br>The breather pipe was/is covered in gooey mayo grease. not a good sign anywhere if you ask me.<br><br>The came with a 30 day warrenty so I took it back to the garage where I bought it from, they said I would have to leave it with them. later that day, the sales man/receptionist (nob head) told me that the engineer couldn't find anything wrong with it, had plugged it into diagnostics and found no faults but did admit that it didn't seem right.<br><br>I'm thinking that they either couldn't actually be bothered to look at it properly or they found a big fault and didn't want to fix it because it would have to be done for free. Maybe not, I just got that sort of vibe from them...<br><br>Soooo...<br>Does anyone out there know what could be wrong with it? <br>I've got a feeling that it's sucking in a load of **** and cant sustain combustion properly so injects a bit more fuel in to compensate, hence the bouncy rev counter at idle...<br><br>The car is alos fine once started up but gets worse at running temp. I've also driven it without the airbox on for a short distance and the idle seemed to handle it a bit better..<br><br>Thanks!
