car stalls at stop?

[6boltpower]

I tryed searching for weeks and now i decieded i would post and ask for help. my 99 420a GS the timing belt snapped its at 163k not bad for never being replaced. since then i pulled the head off the pistons didnt get knicked to bad i changed all 16 valves, i didnt put new valve seats in. i oiled the valves before i installed though, i cleaned the pistons up by sanding them a little, then i started putting back together i put new tensioners on and a water pump, i then had the car together it wouldnt start i looked into see if my timing was right because i was a little sceptical when i was trying to do it late and night very tired, i had the one cam 180 degrees off i thought the 2 cams had to point at eachother turns out they both have to point to the left i made sure the crank was also lined up anyway the second time i did it i roated the motor like 10 times checking it everytime, there lined up, now the car runs, great right? wrong. it will idle around 1k i rev it up a little the idle drops to like 200rpms or so and is shaking the car, there is a popping out of the exhaust occasioanlly its quite and pops every couple seconds, the car normally will catch itself and rev back up when it is idling poorly, but when i drive and i approach a stop holding in the clutch and hit the brakes hard the car stalls, i restart normally having to pump the gas for it work, ive been driving this around for a couple days now and its not going away like i wish it would. the car drives fine other wise that coming to a stop am pullling out, i can get up to highway speeds with no problems and maintane them.. i also changed the oil right when i finished the build..

 

[XiKeiyaZI]

There could be a plethora of things wrong here.

1 : The timing could STILL be off
2 : When you had the timing off the first time, you could have tweaked a few valves
3 : Damaged pistons
4 : Incorrect torque specifications on the head allowing compression to escape
5 : Exhaust Manifold/Intake Manifold not reinstalled correctly

Do a once over on the car, make sure everything is torqued to spec and that you went about tightening sequences in the correct pattern. Again, though, if you had the timing off when you first tried to start the vehicle then it is likely you caused some valve damage.

 

[6boltpower]

btw it is throwing a code for the timing.. saying it might have skipped a tooth etc. some other things but im not home to tell you exactly what the print out says

and when i torqued the head down i had my laptop under the hood of the car going step by step. i did it in 3 steps. i know if i messed up torquing somewhere it wasnt the head. anymore ideas? or are you saying to take it all back apart and double check everything again... i really dont want to do that and buy all new gaskets etc.

 

[TexasMade]

I would personally check your timing first.

 

[XiKeiyaZI]

The way you're describing it as acting after having set the timing and also admitting that it was incorrect the first time and you have since been driving with it backfiring and whatnot.. I'd say it's time to either retime it and HOPE nothing else is damaged (Valves/Cracked pistons) or remove the head, again, and have the valves inspected and check the pistons for cracks. To me? Sounds like either the timing is off a tooth or two or a few of the valves are tweaked.

 

[6boltpower]

ok guys thanks ill check timing tonight and report back to you

well timing seems to be okay if you ask me if i can figure out how to put these pics on here to show u, i tryed cleaning the intake out with some carb cleaner. anyway this turned out to make the car drive great for a while anyway but its still loud and towards the end of the trial run wants to die... im suspecting more on the intake/egr side of things then actual motor internals?

btw this is when the motor is at tdc, the crank lined up perfect. and when i fixed the timing before i made sure that all the pistons were equal before i went adjusting the cams i didnt have any problem.

 

[6boltpower]

its fixed timing was off.

 

[rlacasse1]

I tryed searching for weeks and now i decieded i would post and ask for help. my 99 420a GS the timing belt snapped its at 163k not bad for never being replaced. since then i pulled the head off the pistons didnt get knicked to bad i changed all 16 valves, i didnt put new valve seats in. i oiled the valves before i installed though, i cleaned the pistons up by sanding them a little, then i started putting back together i put new tensioners on and a water pump, i then had the car together it wouldnt start i looked into see if my timing was right because i was a little sceptical when i was trying to do it late and night very tired, i had the one cam 180 degrees off i thought the 2 cams had to point at eachother turns out they both have to point to the left i made sure the crank was also lined up anyway the second time i did it i roated the motor like 10 times checking it everytime, there lined up, now the car runs, great right? wrong. it will idle around 1k i rev it up a little the idle drops to like 200rpms or so and is shaking the car, there is a popping out of the exhaust occasioanlly its quite and pops every couple seconds, the car normally will catch itself and rev back up when it is idling poorly, but when i drive and i approach a stop holding in the clutch and hit the brakes hard the car stalls, i restart normally having to pump the gas for it work, ive been driving this around for a couple days now and its not going away like i wish it would. the car drives fine other wise that coming to a stop am pullling out, i can get up to highway speeds with no problems and maintane them.. i also changed the oil right when i finished the build..

So, I know you said it's all good now. But how did you pull off that part in that I highlighted in bold. Did you even get the vavles lapped in, or did you just throw them in yourself?

You may not be getting the most out of your rebuild if you didn't.

 

[92AWDHX40]

Try a boost leak or a vacuum leak.

 

[rlacasse1]

He already got it fixed. And it's a N/T so a boost leak test would be pointless.

 

[XiKeiyaZI]

its fixed timing was off.

Glad to hear it.

Remember to tag helpful posts as helpful.

 

[92AWDHX40]

Good i didnt see the n/t.

 

[19TalonTuner96]

My wifes Eclipse is doing the same thing his car was doing...been trying to fix it for a while...now...the guy i bought it from said he switched the motors and the back pressure isnt right...idk but we don't drive it much so i usually don't have to deal with it..But atleast now i know what it is...and i will fix it as soon as i get time.