Bbk throttle body
Thread Starter
Junior Member
Joined: Mar 2013
Posts: 81
Likes: 9
From: santa barbara, ca
Car: 88 camaro iroc
Engine: 5.0 TPI
Transmission: 5 spd mannual T5
Axle/Gears: 3.27/ 9 Bolt
Bbk throttle body
I need some help! I recently bought a brand new bbk (1537) throttle body from my coworkers buddy ($150). I installed it on my 92 z28 5.7 engine and it idles fine, but at WOT the car shuts off. Any ideas why?
Joined: Feb 2001
Posts: 8,494
Likes: 411
From: Sophia, NC
Car: 2016 Camaro SS + 1986 Z28
Re: Bbk throttle body
Are you using a new/included throttle position sensor, or the sensor from you old throttle body? I mean it's cable driven, so as long as it's open, and allowing air in, there's nothing else I can think of other than something electrical. ???
Thread Starter
Junior Member
Joined: Mar 2013
Posts: 81
Likes: 9
From: santa barbara, ca
Car: 88 camaro iroc
Engine: 5.0 TPI
Transmission: 5 spd mannual T5
Axle/Gears: 3.27/ 9 Bolt
Re: Bbk throttle body
I'm using the tps and iac valve from the original throttle body. I read the boltage on the tps before intalling on to the new throttle body.(.93 volts close throttle/4.5 volts at open throttle) It reads the same with the new throtten body.
Joined: Dec 2004
Posts: 16,736
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Bbk throttle body
If the tps is adjustable lower it down to .67-.76vdc.
It might be that you have another issue like fuel delivery.
if the minimum idle speed ness to be adjusted down the tps voltage will follow. Iirc set the minimum speed to 650 rpm.
stock injectors not keeping up or weak pump. You can monitor fuel pressure with a gauge strapped to your windshield and do a wot pull.
It might be that you have another issue like fuel delivery.
if the minimum idle speed ness to be adjusted down the tps voltage will follow. Iirc set the minimum speed to 650 rpm.
stock injectors not keeping up or weak pump. You can monitor fuel pressure with a gauge strapped to your windshield and do a wot pull.
Thread Starter
Junior Member
Joined: Mar 2013
Posts: 81
Likes: 9
From: santa barbara, ca
Car: 88 camaro iroc
Engine: 5.0 TPI
Transmission: 5 spd mannual T5
Axle/Gears: 3.27/ 9 Bolt
Re: Bbk throttle body
there's a loud vacuum noise from this hole circled in orange. Is that normal?
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Thread Starter
Junior Member
Joined: Mar 2013
Posts: 81
Likes: 9
From: santa barbara, ca
Car: 88 camaro iroc
Engine: 5.0 TPI
Transmission: 5 spd mannual T5
Axle/Gears: 3.27/ 9 Bolt
Re: Bbk throttle body
No, the tps is non adjustable. I can barely move it to .86 volts close throttle. Should I buy an adjustable one
Joined: Dec 2004
Posts: 16,736
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Bbk throttle body
The tps wouldn’t cause the engine to cut off. You can get a tps for a 86-89 tpi for some reason the adjustable ones are cheaper than the fixed ones.or elongate the tps holes.
Senior Member
Joined: Nov 2004
Posts: 768
Likes: 32
From: Lansing, MI
Car: 1988 IROC-Z
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.45
Re: Bbk throttle body
When the car dies, you don't get any codes?
Nothing about the throttle body should cause the car to die.
The absolute only thing I can think of, and I have never seen this before, is you have a leak around the throttle body gasket. It is running really lean, this is causing it to knock, the computer is pulling so much timing it can't keep running. Or you are so lean the computer can't get enough fuel there... I am not even sure either of these could happen but it's the only thing I can think of related to the throttle body.
Have you scanned for codes. More likely is you are losing spark due to a faulty ICM or you don't have enough fuel due to a weak fuel pump or a restriction of flow.
Do you have a scanner that can look at the BLM's. Would be curious where those are. Also, monitor fuel pressure as said above. You may see it start dropping above 2500RPM under load.
Nothing about the throttle body should cause the car to die.
The absolute only thing I can think of, and I have never seen this before, is you have a leak around the throttle body gasket. It is running really lean, this is causing it to knock, the computer is pulling so much timing it can't keep running. Or you are so lean the computer can't get enough fuel there... I am not even sure either of these could happen but it's the only thing I can think of related to the throttle body.
Have you scanned for codes. More likely is you are losing spark due to a faulty ICM or you don't have enough fuel due to a weak fuel pump or a restriction of flow.
Do you have a scanner that can look at the BLM's. Would be curious where those are. Also, monitor fuel pressure as said above. You may see it start dropping above 2500RPM under load.
Junior Member
Joined: Aug 2018
Posts: 1
Likes: 0
Re: Bbk throttle body
Out of curiosity, when you installed the BBK throttle body, did you have any issues with the throttle cable catching the swivel arm? I installed a BBK on my 87 TA yesterday, and can't seem to route the cable without it catching the arm and causing the car to not idle down once throttled up.
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