1990 NA convertible: Rough Acceleration, RPM drop.
01-12-16, 05:26 PM
#1
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1990 NA convertible: Rough Acceleration, RPM drop.
Hi all, I have a 1990 NA convertible.
I bought the car back in May, and have had a few problems since then. I've fixed most of them, but here is the one that has me stumped:
When I accelerate out of a stop or through a turn, the car sputters, check engine light flickers, and my RPMs drop. I barely have any power. Once I reach a normal speed (25mph+) the sputtering stops, check engine light goes away and I get decent power. The car starts and idles fine (an achievement in itself, though the idle is a little low).
Car is completely stock except for an aftermarket radiator, the previous owner had a new crate engine put in 40k miles ago.
Newer O2 sensor (though it is a Bosch universal one - should I start here?) and plugs.
Thanks.
I bought the car back in May, and have had a few problems since then. I've fixed most of them, but here is the one that has me stumped:
When I accelerate out of a stop or through a turn, the car sputters, check engine light flickers, and my RPMs drop. I barely have any power. Once I reach a normal speed (25mph+) the sputtering stops, check engine light goes away and I get decent power. The car starts and idles fine (an achievement in itself, though the idle is a little low).
Car is completely stock except for an aftermarket radiator, the previous owner had a new crate engine put in 40k miles ago.
Newer O2 sensor (though it is a Bosch universal one - should I start here?) and plugs.
Thanks.
01-12-16, 07:03 PM
#2
Check all grounds. They might not have done a good job with the ground wires when they installed the crate engine.
Check primary injectors. One might be stuck and might need servicing. Usually, when an engine sits for a while the injectors clog up. This could be the case since you have an crate engine and it might have been sitting for a while.
You should start there.
Check primary injectors. One might be stuck and might need servicing. Usually, when an engine sits for a while the injectors clog up. This could be the case since you have an crate engine and it might have been sitting for a while.
You should start there.
01-13-16, 09:01 AM
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The crate engine was installed some 7-8 years ago.
The grounds do sound like a good place to start based on what I was reading. If however that doesn't fix the problem and the injectors are in good shape, what should I check next?
Thanks
The grounds do sound like a good place to start based on what I was reading. If however that doesn't fix the problem and the injectors are in good shape, what should I check next?
Thanks
01-13-16, 10:26 AM
#4
In order to properly fix an issue you will need to do each one of these individually and see if your problem get fixed. It will save you a lot of time and it will help you better understand your car and what the exact issue was.
Check grounds
Check all connection. Make sure they are all plugged in and that you dont have any damaged wires.
Check Injectors. Get them cleaned. it is always a good idea to clean your injectors, especially if the engine has been in the car for 7 to 8 years.
I would even go as far as changing out the ECU with another 1990 convertible one. Your ECU might have an issue ( i doubt it but you never know).
Check this out as well. https://www.rx7club.com/2nd-generati...mptoms-887966/
Good luck
Check grounds
Check all connection. Make sure they are all plugged in and that you dont have any damaged wires.
Check Injectors. Get them cleaned. it is always a good idea to clean your injectors, especially if the engine has been in the car for 7 to 8 years.
I would even go as far as changing out the ECU with another 1990 convertible one. Your ECU might have an issue ( i doubt it but you never know).
Check this out as well. https://www.rx7club.com/2nd-generati...mptoms-887966/
Good luck