Stock 1996 Cobra here. Two questions.
1. Some suppliers state the original pump for 1996 Cobras flowed ~110 L/h at ~44 psi. However, a post in this thread claims 1996 Cobras came with 150 L/h pumps; elsewhere I've read 190 L/h were stock 1996-1997. Suggested aftermarket replacements (Walbro, BBK) range from 110 L/h on up. Can anyone confirm the original pump rate?
2. Some SVT threads (e.g. here) talk about using a Walbro GSS342 (255 L/h); is this the common replacement for the stock pump? If the motor is stock, is there any point in putting in a higher capacity pump? For example, would a 255 L/h pump potentially create problems (fuel heating because of faster cycling of fuel back to the tank)? Any advice or recommendations would be welcome.
Background -- read only if interested
: long term problem with this motor throwing codes related to O2 sensors. After replacing all four HO2 sensors and the SAI pump (thank you, @Captain Fluffy Nuggies!), car ran fine for a few months, then started throwing codes again from sensor 1 (upstream), bank 2 (driver’s side): PO153 (O2 circuit slow response), P1152 (lack of HO2S21 switches - senors indicates rich). A garage I trust said they got it to threw a code as the fuel pressure dropped to 30 psi, so they suggested some part of the fuel system is going bad. Gonna replace upstream sensors again, but given that the fuel pump is so old, thought I’d also start there. If the problem persists after replacing the pump, I’d start looking at the rails, injectors, fuel pressure regulator, etc.
1. Some suppliers state the original pump for 1996 Cobras flowed ~110 L/h at ~44 psi. However, a post in this thread claims 1996 Cobras came with 150 L/h pumps; elsewhere I've read 190 L/h were stock 1996-1997. Suggested aftermarket replacements (Walbro, BBK) range from 110 L/h on up. Can anyone confirm the original pump rate?
2. Some SVT threads (e.g. here) talk about using a Walbro GSS342 (255 L/h); is this the common replacement for the stock pump? If the motor is stock, is there any point in putting in a higher capacity pump? For example, would a 255 L/h pump potentially create problems (fuel heating because of faster cycling of fuel back to the tank)? Any advice or recommendations would be welcome.
Background -- read only if interested
: long term problem with this motor throwing codes related to O2 sensors. After replacing all four HO2 sensors and the SAI pump (thank you, @Captain Fluffy Nuggies!), car ran fine for a few months, then started throwing codes again from sensor 1 (upstream), bank 2 (driver’s side): PO153 (O2 circuit slow response), P1152 (lack of HO2S21 switches - senors indicates rich). A garage I trust said they got it to threw a code as the fuel pressure dropped to 30 psi, so they suggested some part of the fuel system is going bad. Gonna replace upstream sensors again, but given that the fuel pump is so old, thought I’d also start there. If the problem persists after replacing the pump, I’d start looking at the rails, injectors, fuel pressure regulator, etc.
