sr20 problem!!!

[nicku]

so, I swap to a sr20det redtop. In the beginning, I found out the aicv screw was not in there but I didnt think it would be a big problem. So I left it there. And the idle was really high...so I swap the old aicv from my black top to the redtop. and it was fine..the idle is like 800-900 but the car shakes a lot. i went test drive it. When the turbo kicks in, the car hesitates...it doesnt go out smoothly. its like something is holding back the car. but it revs perfectly when the car is stopped. it seems like boost leak...but if it is the boost leak, when the car is stopped, it should act the same?? Or what else should I check for this?

[kuramaya]

may not neccearily act the same when at idle if there is a boost leak. Load on the motor will cause totally different AFR's. i say boost or vacuum leak.

[nicku]

how can i know if there is a boost leak or how can i find the boost leak? I know the vaccum leak i can spray the brake cleaner and test it out. is there anyway i can test the boost leak?

[kuramaya]

You can pressurize the system and see if it leaks...or unfortunately just start from the intake and work your way all the way around and make sure all gromets are sealed tightly. Really your description is shakey but not your fault. Hard to describe things. Whne you get on it, does it sputter, like popping? Without a wideband installed it is hard to tell as well...can someone drive behind you and see if your blowing a shitload of black smoke?

[nicku]

there is not a lot of smoke. I think it does sputter a little bit, it is not so bad. The main thing is the car is shaking while idling, and it hesitates when the turbo kicks in. I've checked all the piping and it didnt seem like loose for me

[burnsauto]

soapy water trick? spray it near the couplers for the piping...get some one to rev it to build a little boost and check for bubbles

...like finding holes in a tire... just an idea though..

[McRussellPants]

Timing.

12 characters blah blah.

[nicku]

icic...i will try that tomorrow. and the other thing is...would it be misfiring since I havent changed the spark plugs after i got this engine

[nicku]

timing will cause this, too?

[burnsauto]

icic...i will try that tomorrow. and the other thing is...would it be misfiring since I havent changed the spark plugs after i got this engine


wait....you still have the same plugs it came with when you got you're engine???? ....go spend 7 bucks on plugs. NGK BCPR6E-11 (stock number:5632)

[nicku]

will it make difference?

[nicku]

Changed the spark plugs today....the car feels a little better...it doesnt feel like boost leak anymore...but somehow the car feels like misfiring. What should I check for misfiring?? and the car dies by itself, too. Good news is the compression test result wasnt bad

[nicku]

by adjusting the timing and the aicv, the idling is good and the car doesnt die anymore, but it still feels like misfiring. I could not hear any misfiring from the cylinders...we checked the injectors, coilpack, what else could it be??? any idea would help, please

[RYAN_S-14]

Note: This thread originally was online, but was mistakenly deleted. Old backups were used to get it back, but it had to be manually copied-and-pasted here.

Original thread started by HotshtSR20.



buy a 2" PVC cap at home depot. it should be 2.5" OD.

buy some valve stems from Kragen, Pep Boys or Autozone (if going to Pep Boys or Autozone, make sure to pick up some ricey lights, wings and mufflers while there)

drill a hole the same size as the skinny part of the valve stem between to two rubber bumps.

add some RTV silicone to make sure its leak free.

hose clamp it onto the compressor inlet or inlet piping (try to clamp it onto something bead rolled, otherwise, it likes to shoot right off, dont ask me how i know) and pressurize until your boost gauge hits whatever max PSI you plan on hitting.

listen for leaks and fix them.

i like to unplug the BOV recirc pipe to see if the BOV is leaking.sr20forum quote

[rightcoastimports]

the cam angle sensor or your ignitor could be going bad.. what are you running for a fuel pump, stock or walbro?

[nicku]

stock....everythign on the engine is stock....i got this engine not too long ago from JR auto parts

[nicku]

Now the car keeps dying and the way it dies its like i shut off the car by turning off the key. It dies in a sudden. And it doesnt rev above 3500. Any idea guys?

[cheapscheisst]

check your timing. that is all.

[burnsauto]

yeah...timing or maybe the maf is starting to go..

[nicku]

and just figure out the head gasket got leak, too.....

[Drftn93SR]

OK this is really wierd, but I am have the exact problem, I sent my car to JGY Customs... (Good guys) They are about 2 hours away from my house... It drove the best it had ever driven! Got all the way to the end of my street and the problem began! I was perfectly fine, it will start up, and idle a little rough but nothing to seem to worry about, then i will be going down the road, and all during vacuum i am fine, but the second i hit boost it just hesitates like it doesnt want to go! I had the timing done before i brough it back, so i doubt it is that! Im thinkn maybe its a maf prob, cus i cant find a boost leak, i have done the water test, and didnt find anything. But just looking for some options... and opinions...

[S130oner17]

now i haven't worked on many turbo engine's but you can get a miss fire condition due to the maf sending the ecu the wrong resistance reading. for example: say the engineer calculated at 10 mph that you have a certain amount of air going through; then the maf is actually telling the comp that your running rich (too much) on air and lean (less) on fuel so the ecu will bump up on fuel causing a miss-fire. or the opposite lean on air rich on fuel. if you would be lean on air you would have the black smoke out the tailpipe. if you can get a resistance spec of the stock maf and checked your and then compare to a known good maf that would help but you have to check the maf unplugged to get a resistance reading, then if it is bad just upgrade to a z32 maf if you have the money. maf's ain't cheep.

[kevtrinh]

tps sensor could be off too

[nicku]

did the timing today, and the car idles perfrectly fine!!! im so happy!!!

[rightcoastimports]

so all fixed??

[srgabe]

gona try the same

[nicku]

one thing came up...ever since i did the timing, the car idles perfectly....but one thing is bugging me which is when the turbo kicks in that moment...around that 500rpm, the car hesitates a little bit...you can clearly feel the car doesnt run smooth...but after that, you can feel the power comes out again...just between 3000 to 3500 rpm...the car has hesitation. what would be the problem, guys?

[rightcoastimports]

could be the maf.. or a sensor thats grounded out that shouldnt be or the block not being grounded good enough.. could be a lot of things!!