what can cause hesitation when cruising?

[wzntha]

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[the converted]

Have you checked your TPS? Make sure the full throttle and closed voltages are good and that it goes smoothly in between them.

[aznrib]

I had the same hestitation issue. For me I found a loose t-bolt clamp and I also replaced the Coolant Temp Sensor (CTS). After I replaced the cts and tightened the t-bolt clamp, I am not experiencing any more hesitation but it still not pulling the way its suppose to but I'm still getting the idle drop. I'm still in the process of troubleshooting it.

Another thing you can try to check for is the timing.

[Koshin]

I know it sounds cliche, but check for vacuum leaks

Rich

[wzntha]

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[aznrib]

any luck on the problem?

[wzntha]

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[aznrib]

yep. It happened to me yesterday when I thought it stopped lol. Its very inconsistent for me. It would be sluggish sometimes but other times its a smooth transition from vac to boost. I have a hunch that it can be the tps, which I will check this weekend.

[wzntha]

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[fast_s13]

what kind of BOV are you running

[wzntha]

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[fast_s13]

have you checked the tps?

[wzntha]

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[aznrib]

wow nice find. didn't think an O2 can cause that problem. I'll check mine too. Did you try to put a multi meter to the sensor to see if it works?

[wzntha]

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[boro drift]

What intercooler are you running?

[wzntha]

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[aznrib]

nice. Keep us posted if the o2 fixes the problem. The o2 sensor was the next thing I was gonna look at. I have a fmic though so i dunno if its related.

[boro drift]

i have the stock intercooler. what would the intercooler have to do with this? (heat soak??). im planning to change it out soon though.

When I had my stock intercooler, one of the end tanks separated from the core, causing a serious vacuum leak. The tanks are just crimped on, not very strong. I would do a boost leak test and spray soapy water all over that sob.

[wzntha]

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[aznrib]

i'll check out my intercooler too, i guess. how do you do the soapy water thing? do you just spray it on there while the engine is running? if there is a leak, won't the soapy water just end up going into your engine?

you cant build up boost in idle. To test for boost leak you have to pressurize the pipping from the turbo to the throttle body. You can use pvc caps and valve stems to do this. If you google boost leak tester, theres a bunch of websites that pop up. The soapy water is just so you can see the leaks easier because of the bubbles.

[wzntha]

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[aznrib]

i guess we'll see what happens after the o2 is replaced. Were you also running rich in between shifts?

[boro drift]

i read on a thread where some guy said to spray the soap water while the car is running, which i why i was confused, haha. it didn't seem too smart to risk getting water into the engine...

now it makes more sense when you use it with a boost leak tester. but i don't think my car has any boost leaks though, because it pulls 22-23 inHg of vacuum

Yeah, my car held steady vacuum,20inHg, with the leak. When I finally did a boost leak test and I couldn't get more than 1 psi, I knew I had a problem somewhere in the system.

[wzntha]

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[aznrib]

Thats what i'm getting also. I was leaning towards boost leak since the maf is reading a certain amount air and adjusting for the amount of fuel to throw in but somewhere in the pipping theres a leak which is causing for more fuel to be in the system then needed and causing the lack of power. Thats just my theory but have yet to test it.

[wzntha]

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[boro drift]

It will be fine.

[aznrib]

report back to us after you replace the o2