My fzj80 isn't running smoothly, slight misfire, ticking from the front/top of the engine. No CEL (sadly) and it runs okay. When the engine is cold, and I first start it up it runs absolutely amazing, no ticking, not misfire, no shaking. Once it warms up and starts reading the sensors it runs rough. Idle settles around 650 + or - 50. Idles around 1000 rpm in Drive.
First off what has been done to the vehicle (348k miles): ALL parts OEM unless Stated:
- Engine rebuild (top and bottom full refresh) 15k ago
- new fuel injectors
-new engine wiring loom
- new cooling system hoses, radiator, thermostat, water pump
- new TPS
- new O2 sensors (denso)
- new Mangaflow y-pipe and second cat (my old ones were shot)
- new distributor (cardone)
-new sparkplugs (less than 1k ago iridium)
- new spark plug wires
-new air filter
- new fuel filter
- new fuel pump and sending unit
- EGR delete
- new ignition coil
- new fuel regulator
- newish belts (20k)
- swapped main pulley
- new fan clutch and blade
- new charcoal canister
- new fuel filter cap
- new knock sensors (2x)
- temp sensor (aftermarket unknown brand)
Now you can see my frustration why this thing isn't running like a top... Everything I can think of has been checked against the FSM. Because it runs good when it's cold I assume it's a sensor... But no CEL so I'm running in circles.
Known issues:
- front exhaust manifold middle bolts are slightly stripped and aren't as tight as the rest
- possible issue with the VSV (THIS WAS THE ISSUE)
Issues listed in the comments (condensed for viewers ease)
- Vacuum leak, cracked tube, wrong size (THIS WAS THE ISSUE - replaced entire vac system)
-Oil filler cap o-ring rock hard (replaced due to age, wasn't an issue)
- PCV valve grommet brittle (was replaced not an issue)
- Dipstick o-ring (didn't have time to check before issue was resolved, will be switching it out)
- Intake air tube not cracked (mine was in good condition)
- Timing off a gear (checked and moved, but wasn't the issue)
- IAC (idle air control valve) - ( checked against FSM was bad, but didn't solve my issue)
- Fuel Octane rating too low (didn't check due to gas prices)
Fixing the Issue: $320.53 (from Partsouq and Toyota parts deal not including IAC approx $400)
I replaced all the Vac lines, switches, couplers, everything that was still on the market in one go. Solved the issue and now runs extremely smoothly.
Parts replaced: FOR 1995 1FZ-FE
9099992002 - Vac line (you'll need about 4 of these)
2582013020 - valve bi-metal
9091710049 - gas filter #1
9091005212 - Large vac hose
9613251100 - larger vac clamps
9092503192 - Valve vac control (the thing with the blue cap)
9533306010 - Evap hose
9091012079 - VSV #1
9091012079 - VSV #2
9033903002 - plug
List does not include:
- intake manifold "gas" valve
- any egr components
-intake manifold gaskets (THESE ARE NEEDED)
First off what has been done to the vehicle (348k miles): ALL parts OEM unless Stated:
- Engine rebuild (top and bottom full refresh) 15k ago
- new fuel injectors
-new engine wiring loom
- new cooling system hoses, radiator, thermostat, water pump
- new TPS
- new O2 sensors (denso)
- new Mangaflow y-pipe and second cat (my old ones were shot)
- new distributor (cardone)
-new sparkplugs (less than 1k ago iridium)
- new spark plug wires
-new air filter
- new fuel filter
- new fuel pump and sending unit
- EGR delete
- new ignition coil
- new fuel regulator
- newish belts (20k)
- swapped main pulley
- new fan clutch and blade
- new charcoal canister
- new fuel filter cap
- new knock sensors (2x)
- temp sensor (aftermarket unknown brand)
Now you can see my frustration why this thing isn't running like a top... Everything I can think of has been checked against the FSM. Because it runs good when it's cold I assume it's a sensor... But no CEL so I'm running in circles.
Known issues:
- front exhaust manifold middle bolts are slightly stripped and aren't as tight as the rest
- possible issue with the VSV (THIS WAS THE ISSUE)
Issues listed in the comments (condensed for viewers ease)
- Vacuum leak, cracked tube, wrong size (THIS WAS THE ISSUE - replaced entire vac system)
-Oil filler cap o-ring rock hard (replaced due to age, wasn't an issue)
- PCV valve grommet brittle (was replaced not an issue)
- Dipstick o-ring (didn't have time to check before issue was resolved, will be switching it out)
- Intake air tube not cracked (mine was in good condition)
- Timing off a gear (checked and moved, but wasn't the issue)
- IAC (idle air control valve) - ( checked against FSM was bad, but didn't solve my issue)
- Fuel Octane rating too low (didn't check due to gas prices)
Fixing the Issue: $320.53 (from Partsouq and Toyota parts deal not including IAC approx $400)
I replaced all the Vac lines, switches, couplers, everything that was still on the market in one go. Solved the issue and now runs extremely smoothly.
Parts replaced: FOR 1995 1FZ-FE
9099992002 - Vac line (you'll need about 4 of these)
2582013020 - valve bi-metal
9091710049 - gas filter #1
9091005212 - Large vac hose
9613251100 - larger vac clamps
9092503192 - Valve vac control (the thing with the blue cap)
9533306010 - Evap hose
9091012079 - VSV #1
9091012079 - VSV #2
9033903002 - plug
List does not include:
- intake manifold "gas" valve
- any egr components
-intake manifold gaskets (THESE ARE NEEDED)
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