what can this be (boost problem)?
06-29-04, 09:38 PM
#1
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what can this be?
first off i have a 30min ride to work in the morning. so on the way in this morning everything was fine for the first half of the ride boost was were it should be. then about 20min or so into my ride i started noticing that in all gears i was boosting 6psi and no more. My pattern was 6-5-6 in all gears.
Can a clogged down pipe be the culpert, it seems to happen only when the car has be driven for a long time(20-30min). It will not go passed 6psi on the boost gauge.
Please i need some good feed back here.
The car has 86,000 miles on it and 8,500 on the rebuild has the orginal down pipe and mid pipe.
thanks for the help guys.
Can a clogged down pipe be the culpert, it seems to happen only when the car has be driven for a long time(20-30min). It will not go passed 6psi on the boost gauge.
Please i need some good feed back here.
The car has 86,000 miles on it and 8,500 on the rebuild has the orginal down pipe and mid pipe.
thanks for the help guys.
06-29-04, 10:50 PM
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i don't think it would be a clogged cat/pre-cat as this would tend to effect the upper rpm area.
it sounds as though boost is being controlled off the wastegate and precontrol actuator spring pressures only. which means the wastegate and turbo pre-control solenoids may not be working. see if you get any error codes in these areas, otherwise check the plugs to the solenoids
it sounds as though boost is being controlled off the wastegate and precontrol actuator spring pressures only. which means the wastegate and turbo pre-control solenoids may not be working. see if you get any error codes in these areas, otherwise check the plugs to the solenoids
06-29-04, 10:52 PM
#7
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Originally posted by Mahjik
Check the wastegate actuator. Sounds like the wastegate isn't functioning since you are limited to 6-7 PSI (which is the lowest the wastegate will allow as long as there aren't any other problems).
Check the wastegate actuator. Sounds like the wastegate isn't functioning since you are limited to 6-7 PSI (which is the lowest the wastegate will allow as long as there aren't any other problems).
look throught this:
http://www.autosportracetech.com/RX-...leshooting.htm
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06-29-04, 11:03 PM
#8
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if you punch it does it jump to 10 but immediatly drop back to 6?......im having a similar problem but i belive my main cat is clogged. btw, get rid of that stock pre cat.
06-30-04, 08:21 AM
#10
Originally posted by mad_7tist
controll solenoid. if it's fine hot but goes to ~6 psi the solenoid is prob not functional when hot. how did you check it?
controll solenoid. if it's fine hot but goes to ~6 psi the solenoid is prob not functional when hot. how did you check it?
06-30-04, 10:19 AM
#12
Re: what can this be?
Originally posted by rx7???rx7#1
first off i have a 30min ride to work in the morning. so on the way in this morning everything was fine for the first half of the ride boost was were it should be. then about 20min or so into my ride i started noticing that in all gears i was boosting 6psi and no more. My pattern was 6-5-6 in all gears.
Can a clogged down pipe be the culpert, it seems to happen only when the car has be driven for a long time(20-30min). It will not go passed 6psi on the boost gauge.
Please i need some good feed back here.
The car has 86,000 miles on it and 8,500 on the rebuild has the orginal down pipe and mid pipe.
thanks for the help guys.
first off i have a 30min ride to work in the morning. so on the way in this morning everything was fine for the first half of the ride boost was were it should be. then about 20min or so into my ride i started noticing that in all gears i was boosting 6psi and no more. My pattern was 6-5-6 in all gears.
Can a clogged down pipe be the culpert, it seems to happen only when the car has be driven for a long time(20-30min). It will not go passed 6psi on the boost gauge.
Please i need some good feed back here.
The car has 86,000 miles on it and 8,500 on the rebuild has the orginal down pipe and mid pipe.
thanks for the help guys.
Remove the UIM. Under it is what the manual called a T/C (turbo control) solenoid. Due to its location, this sucker stops working when the engine is hot.
Buy a new one. Wrap it in heat shielding.
06-30-04, 09:02 PM
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Re: Re: what can this be?
Originally posted by pomanferrari
Sounds like the TC solenoid.
Remove the UIM. Under it is what the manual called a T/C (turbo control) solenoid. Due to its location, this sucker stops working when the engine is hot.
Buy a new one. Wrap it in heat shielding.
Sounds like the TC solenoid.
Remove the UIM. Under it is what the manual called a T/C (turbo control) solenoid. Due to its location, this sucker stops working when the engine is hot.
Buy a new one. Wrap it in heat shielding.
https://www.rx7club.com/showthread.p...79#post3212979
the Turbo Control Actuator is run by 2 soleniods; 1 that supplies vacuum and another that applies a pressure to activate the actuator. the pressure and vacuum should only be activated by the solenoids after 4500rpm. you can test it just as i did (where i found the vacuum solenoid not working)
TCA testing:
1. Pull off strut brace and pressure chamber (can leave hoses attatched)
2. You should see four 4mm metal hard hoses that come up. Two of them go to the solenoids mounted on the front of the UIM, forget them (wastegate and turbo pre-control solenoids). The other pair should have rubber hoses that connect them to the rat's nest. You need to tee into these.
3. One at a time tee into the hoses and connect a boost gauge. The pressure side (forward hose IIRC) should sit at zero until you go past 4500. Then it should kick over to 10psi. The vacuum should kick over to at least 15mmHg.
1. Pull off strut brace and pressure chamber (can leave hoses attatched)
2. You should see four 4mm metal hard hoses that come up. Two of them go to the solenoids mounted on the front of the UIM, forget them (wastegate and turbo pre-control solenoids). The other pair should have rubber hoses that connect them to the rat's nest. You need to tee into these.
3. One at a time tee into the hoses and connect a boost gauge. The pressure side (forward hose IIRC) should sit at zero until you go past 4500. Then it should kick over to 10psi. The vacuum should kick over to at least 15mmHg.
Last edited by ORX705; 06-30-04 at 09:05 PM.
06-30-04, 09:07 PM
#15
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this picture may help to find solenoids and hoses
http://www.zeroglabs.com/rx7/images/...oses.color.jpg
http://www.zeroglabs.com/rx7/images/...oses.color.jpg
06-30-04, 10:02 PM
#16
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thanks for the info guys
yesterday when i was lookin around i noticed a vacuum leak in the center of the engine under the uim. i sprayed carb cleaner there and the car stumbled. it also sounds like a hissin noise. the car has the orginal vacuum lines in it. what do u guys think could this the problem.
yesterday when i was lookin around i noticed a vacuum leak in the center of the engine under the uim. i sprayed carb cleaner there and the car stumbled. it also sounds like a hissin noise. the car has the orginal vacuum lines in it. what do u guys think could this the problem.
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