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Old 03-08-2010, 04:36 PM   #1
john_lauj
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Default my 89 supra turbo choke at 3800 rpm

yea my 89 supra turbo chokes and gets fuel cut. when i bought the car the guy said he was boost about 12 psi. so wat i did was i got a ls400. it stop the fuel cut but still the car was hesitated to go past 4000 rpm. so my next guest was to put a 3 inch all the way. i did it but now i get the fuel cut again and still choke about 3800rpm.

ANY HELP GUYS
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Old 03-08-2010, 04:48 PM   #2
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Did you check the gap on your plugs. I had a hick-up at around 4500 to 5000 and thats what my issue was.
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Originally Posted by john_lauj View Post
yea my 89 supra turbo chokes and gets fuel cut. when i bought the car the guy said he was boost about 12 psi. so wat i did was i got a ls400. it stop the fuel cut but still the car was hesitated to go past 4000 rpm. so my next guest was to put a 3 inch all the way. i did it but now i get the fuel cut again and still choke about 3800rpm.

ANY HELP GUYS
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Old 03-08-2010, 04:49 PM   #3
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Mines doing the exact same thing.... Except at like 4200. I just changed the fuel filter, and found out my wastegate actuator wasn't connected to the wastegate flange. So I hooked it back up, and now it's doing that.

It's crazy. If you get any break throughs let me know lol I shall do the same.
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Old 03-08-2010, 04:54 PM   #4
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Also my boost is no accurate. 1 gear ill be boosting 4psi, 2 ill be boosting anywhere from 4-6, and same with the rest of the gear. if i keep pushing it, ill get fuel cut about 4500-5000 rpm.. oh yea i also recently replace my spark plugs too.
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Old 03-08-2010, 05:00 PM   #5
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Quote:
Originally Posted by john_lauj View Post
Also my boost is no accurate. 1 gear ill be boosting 4psi, 2 ill be boosting anywhere from 4-6, and same with the rest of the gear. if i keep pushing it, ill get fuel cut about 4500-5000 rpm.. oh yea i also recently replace my spark plugs too.
What was the gap you set them for ? and did you look to see if your coils had any cracks (people have had this hapen before) on them.
Do you have a FMIC?
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Old 03-08-2010, 05:08 PM   #6
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it came pre gap already. im also a new member to the mk3 family so like fmic or afm all that is new to me so can u please b more specific with me. i will like to learn them too.
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Old 03-08-2010, 05:12 PM   #7
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Quote:
Originally Posted by john_lauj View Post
it came pre gap already. im also a new member to the mk3 family so like fmic or afm all that is new to me so can u please b more specific with me. i will like to learn them too.
The gap is usually preset but can be out of range from the factory. i would pull them out and get one of those 1$ gauges from Autozone and make sure they were all at the same setting. Secondly a Front Mount Inter Cooler or FMIC would have cylicone hoses that could have a leek.
Air Fuel Meter = AFM
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Old 03-08-2010, 06:18 PM   #8
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if i slowly gas it will go with no choke. only when the turbo spool hard is when i get the choke. someone has told me that its my speed box unit but i doubt it. i dont want that to be the problem.
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Old 03-08-2010, 06:20 PM   #9
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Quote:
Originally Posted by john_lauj View Post
if i slowly gas it will go with no choke. only when the turbo spool hard is when i get the choke. someone has told me that its my speed box unit but i doubt it. i dont want that to be the problem.
Dude i had this same issue i could go easy and excelerate so there was no missfire but if i punched it it would miss around 4-5. Re-gap our plugs to around .028. do this then let us know what ahppens
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Old 03-09-2010, 01:28 AM   #10
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Quote:
Originally Posted by john_lauj View Post
yea my 89 supra turbo chokes and gets fuel cut. when i bought the car the guy said he was boost about 12 psi. so wat i did was i got a ls400. it stop the fuel cut but still the car was hesitated to go past 4000 rpm. so my next guest was to put a 3 inch all the way. i did it but now i get the fuel cut again and still choke about 3800rpm.

ANY HELP GUYS
What size injectors are you running? You say you added a Lex AFM, but you don't say anything about upgrading the injectors along with it... which you need to.
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