This is my 1fz,
Pretty sweet hey,
Except it runs like a dog,
1993, manual, aus spec 80
Got it on the road ran beautifully for a few weeks, until the start of this week when I noticed it bogging accelerating from the traffic lights at the end of my street.
I’d describe it like a carby car when cold, you put your foot down and the motor noise increases but it doesn’t really go faster and occasionally jerks as it comes up in rpm.
Feels like it’s worst at 1000 - 2500rpm
Problem is way less severe when warm but still feels like it’s lost a fair few ponies.
Its done 400,000km, what ever that is in freedom units,
I was expecting filter or pump as it lacks the ignition break down noises I’m used to when one of these kill a set of leads or plugs.
I’ve thrown a new pump and filter at it - no change
Confirmed the flappy maf is triggering the fuel pump
Bypassed fuel pump resistor - no change
Bypassed the entire fuel pump control circuit and relay - no change
Fresh 98 fuel and injector cleaner.
Pulled plugs, none are wet look a little lean but nothing really stood out.
Yesterday it felt like the ecu really struggled to maintain a idle, would slowly drop become increasingly choppy until about 150rpm, almost stall then go back up to 1100rpm and repeat.
I haven’t experienced this again.
Being an Australian car it has no EGR so the harness doesn’t get cooked, I have had a good visual look at the rest of the harness and it looks ok, even near the knock sensors.
Also no engine codes with the terminals jumpered.
They never come with cats here so nothing to collapse.
The intake tube isn’t cracked.
I’m just about to dive into checking sensors and such with a multimeter.
Is there anywhere I should start? Also what’s the probability of the fuel reg dying? The reg vacuum port filter is clean and not blocked.
I’m also very tempted to cut my losses already and put a haltech in it.
Pretty sweet hey,
Except it runs like a dog,
1993, manual, aus spec 80
Got it on the road ran beautifully for a few weeks, until the start of this week when I noticed it bogging accelerating from the traffic lights at the end of my street.
I’d describe it like a carby car when cold, you put your foot down and the motor noise increases but it doesn’t really go faster and occasionally jerks as it comes up in rpm.
Feels like it’s worst at 1000 - 2500rpm
Problem is way less severe when warm but still feels like it’s lost a fair few ponies.
Its done 400,000km, what ever that is in freedom units,
I was expecting filter or pump as it lacks the ignition break down noises I’m used to when one of these kill a set of leads or plugs.
I’ve thrown a new pump and filter at it - no change
Confirmed the flappy maf is triggering the fuel pump
Bypassed fuel pump resistor - no change
Bypassed the entire fuel pump control circuit and relay - no change
Fresh 98 fuel and injector cleaner.
Pulled plugs, none are wet look a little lean but nothing really stood out.
Yesterday it felt like the ecu really struggled to maintain a idle, would slowly drop become increasingly choppy until about 150rpm, almost stall then go back up to 1100rpm and repeat.
I haven’t experienced this again.
Being an Australian car it has no EGR so the harness doesn’t get cooked, I have had a good visual look at the rest of the harness and it looks ok, even near the knock sensors.
Also no engine codes with the terminals jumpered.
They never come with cats here so nothing to collapse.
The intake tube isn’t cracked.
I’m just about to dive into checking sensors and such with a multimeter.
Is there anywhere I should start? Also what’s the probability of the fuel reg dying? The reg vacuum port filter is clean and not blocked.
I’m also very tempted to cut my losses already and put a haltech in it.