Corolla Exhaust problem

This type of noise is usually caused by malfunctioning valve lifters or an exhaust manifold leak. If the noise lasts for more than a minute and completely disappears or dimishes after the engine is warm, the most likely cause is an exhaust manifold leak. If the noise only lasts for a few seconds, the most likely cause is a valve lifter malfunction. You should start your diagnosis with a visual inspection of the exhaust system. Inspect the exhaust manifolds for leaking gaskets or cracks. Black soot marks where the manifold mates to the cylinder head are key indicators of an exhaust manifold gasket leak. Inspect for broken exhaust manifold bolts. Inspect the gasket area where the manifold bolts to the exhaust pipe. Small exhaust leaks can often self seal once the metal engine parts are heated and expanded.
If there are no signs of an exhaust leak and the noise dissipates a few seconds after starting the vehicle, you should suspect an oil control or valve lifter malfunction. Hydraulic valve lifters use the engines oil pressure to expand the lifter which provides a zero valve lash clearance. This prevents the valves from tapping. When the engine is shut off, a valve and spring in the lifter keep it expanded and retain the oil within the lifter. If the valve or spring allows the oil to drain from the lifter, it will collapse. Upon start up, the lifter will take a few moments to "pump up" and expand as the oil pressure builds in the engine. During this time, the valves may tap since there is clearance between the rocker arm and lifter..

FOR MORE DETAILED HELP CLICK THE LINK BELOW:

https://carrepairworld.blogspot.com/2021/06/car-valve-chatter-only-at-startup.html

THIS WILL HELP THANKS.

This is pretty straight forward, you need to locate the exhaust manifold and follow it down to where it connect to the exhaust pipe, there three bolts on the joint and you take those out. Then see if you can separate the pipe from the manifold. If you cannot separate them then you need to get under the jeep and loosen the holders for the exhaust pipe. When you can separate the joint, take the old doughnut out and put in the new one. Make sure that you get it tight and that you tighten the bolts evenly. Don't over tighten one side.

Look on the exhaust manifold just before it connects to the exhaust at the doughnut gasket

Some cars don't need donuts. Look at the exhaust manifold and check if it is coned shaped. If it is then you don't need the donut gaskets.

Right-Hand
Removal

1. Remove spark plug heat shield (12A406).
   

1. Remove distributor to spark plug wires (12286) using Spark Plug Wire Remover T74P-6666-A.
   
1. Disconnect muffler inlet pipe.
   
1. If equipped with secondary air injection, disconnect the secondary air injection check valve tube (9B480).
   
1. Remove attaching bolts and right exhaust manifold (9430).
   
1. Inspect joint faces for signs fo exhaust leaks, cracks or any defect that would make exhaust manifold unfit for use
   

Left-Hand Removal






1. Remove oil level indicator tube (6754).

1. Remove spark plug heat shield.
   

1. Remove distributor to spark plug wires using Spark Plug Wire Remover T74P-6666-A.
   

1. Disconnect EGR valve to exhaust manifold tube (9D477). If equipped with air injection, disconnect the secondary air injection check valve tube.
   

1. Disconnect muffler inlet pipe.
   

1. Remove attaching bolts and exhaust manifold (9431).
   

1. Inspect joint faces for signs of exhaust leaks, cracks or any defect that would make the exhaust manifold unfit for use.
   

Installation

1. Clean mating surfaces of right exhaust manifold or left exhaust manifold and cylinder head (6049). Clean mounting flange of right exhaust manifold or left exhaust manifold and inlet pipe(s). Clean mounting surface for air injection tube or right exhaust manifold. Apply light film of Premium Long-Life Grease XG-1-C or -K or equivalent meeting Ford specification ESA-M1C75-B to right exhaust manifold or left exhaust manifold.
   

1. Position right exhaust manifold or left exhaust manifold on cylinder head. Install attaching bolts and washers, starting at fourth bolt hole from front of each right exhaust manifold or left exhaust manifold. Tighten bolts to 34-47 Nm (25-35 lb-ft), working from center right to both ends.
   
1. Position inlet pipes to right exhaust manifold or left exhaust manifold. Install attaching nuts and tighten to 34-47 Nm (25-35 lb-ft).
   
1. Position the secondary air injection check valve tube and the secondary air injection tube gasket (9C435) at rear of right-hand exhaust manifold. Install attaching bolts and tighten to 19-25 Nm (14-18 lb-ft).
   
1. Attach the secondary air injection manifold tube (9B449) to left-hand exhaust manifold fitting (located under EGR tube). Tighten nut to 30-40 Nm (22-30 lb-ft).
   
1. Attach the secondary air injection check valve tube to rear of right-hand cylinder head. Tighten bolts to 75-85 Nm (56-62 lb-ft).
   
1. Connect EGR valve to exhaust manifold tube to left exhaust manifold, if removed. Tighten nut to 53-72 Nm (39-53 lb-ft).
   
1. Install spark plug heat shield and distributor to spark plug wires.
   
1. Install oil level indicator tube to left exhaust manifold, if removed. Tighten nut to 13-24 Nm (10-18 lb-ft).
   
2. Start engine (6007) and check for exhaust leaks.
   

Hope this helps you...WF †

It`s probably the exhaust doughnut between the exhaust pipe and the exhaust manifold its a gasket that can move around and be damaged easly

Check and review this info: ZJ-Secc-11-Exhaust-System-and-Intake-Manifold

In this pages find several graphics that can be help you.

Good luck!!!

there is no connection betwen the doughnut gasket on the outlet of the exhaust manifold and the head gasket. The head gasket is under the cylinder head and does not crack. It may blow due to compression pressure leaking between the head and the block.
Are you sure you don't have a brkoen stud on the exhaust manifold where it mounts to the blcok? Known Nissan isue. The bolts don't stretch when hot and eentaully they all break off. Newer studs do stretch.

96 escort 1.9L




Engine Components
Item Part Number Description 1 6766 Oil Filler Cap 2 6A548 (8 Req'd) Valve Cover Bolt 3 6582 Valve Cover 4 — Exhaust Manifold Shield-to-Exhaust Manifold Nut (4 Req'd) 5 9A462 Exhaust Manifold Shield 6 — Exhaust Manifold Shield Stud (4 Req'd) 7 9430 Exhaust Manifold 8 9454 Exhaust Manifold Nut 9 9448 Exhaust Manifold Gasket 10 — Exhaust Manifold Stud (Fine Thread), Short (4 Req'd) 11 — Exhaust Manifold Stud, Long (1 Req'd) 12 — Exhaust Manifold Stud (Medium Thread), Short (1 Req'd) 13 6518 Valve Spring Retainer Key 14 6514 Valve Spring Retainer 15 6513 Valve Spring and Damper, Intake 16 6C515 Valve Tappet Guide Plate Retainer 17 6571 Valve Stem Seal 18 6513 Valve Spring, Exhaust 19 12405 Spark Plug 20 6269 Camshaft Thrust Plate 21 — Camshaft Thrust Plate Bolt (2 Req'd) 22 — Cup Plug 23 6B273 Camshaft Oil Flow Control Rod 24 6K292 Camshaft Front Seal 25 6256 Camshaft Sprocket 26 6278 Camshaft Sprocket Washer 27 6K252 Camshaft Sprocket Retaining Bolt 28 6L269 Camshaft Sprocket Key (5 x 18) 29 6250 Camshaft 30 6051 Head Gasket 31 6A008 Cylinder Head to Block Dowel 32 6010 Cylinder Block 33 6507 Intake Valve 34 6505 Exhaust Valve 35 6049 Cylinder Head 36 — Intake Manifold Stud (7 Req'd) 37 17A084 Engine Lifting Eye 38 — Engine Lifting Eye Bolt (2 Req'd) 39 9439 Intake Manifold Gasket 40 — Bolt 41 9723 Accelerator Cable Bracket 42 9424 Intake Manifold 43 — Intake Manifold Nut (7 Req'd) 44 9D476 EGR Valve Gasket 45 — Exhaust Gas Recirculation (EGR) Valve Bolt (2 Req'd) 46 9D475 EGR Valve 47 — Fuel Injection Supply Manifold Bolt
(2 Req'd) 48 9F593 Fuel Injector 49 9D930 Fuel Charging Wiring 50 6786 Oil Level Indicator Tube Bracket 51 — Oil Level Indicator Tube Bracket Bolt 52 6754 Oil Level Indicator Tube 53 6750 Oil Level Dipstick 54 9D280 Fuel Injection Supply Manifold 55 — Vacuum Fitting 56 9E498 Main Emission Vacuum Control Connector 57 — Vacuum Tap 58 — Vacuum Hose 59 9B989 Throttle Position Sensor 60 — Screw and Washer 61 9F782 Throttle Position Sensor Gasket 62 — Throttle Body Bolt (4 Req'd) 63 — Idle Air Control (IAC) Valve Bolt
(2 Req'd) 64 9F715 Idle Air Control Valve 65 9F670 Idle Air Control Gasket 66 9E926 Throttle Body 67 9E936 Throttle Body Gasket 68 — Vacuum Fitting 69 — Camshaft Position Sensor Screw 70 6B288 Camshaft Position Sensor 71 8255 Water Hose Connection Gasket 72 — Water Hose Connection Bolt (3 Req'd) 73 8592 Water Hose Connection 74 8575 Water Thermostat 75 6065 Cylinder Head Bolts 76 6500 Valve Tappet 77 6K512 Valve Tappet Guide Plate 78 6564 Rocker Arm 79 6A528 Rocker Arm Seat 80 6A527 Rocker Arm Bolt (8 Req'd) 81 — Ignition Coil Mounting Bracket Bolt
(3 Req'd) 82 18827 Noise Filter Condenser 83 — Ignition Coil Mounting Bolt (4 Req'd) 84 12259 Spark Plug Wire Set 85 12029 Ignition Coil 86 12043 Ignition Coil Mounting Bracket A — Tighten to 5-12 Nm (4-9 Lb-Ft) B — Tighten to 5-7 Nm (3-5 Lb-Ft) C — Tighten to 21-26 Nm (16-19 Lb-Ft) D — Tighten to 2-10 Nm (1.5-7 Lb-Ft) E — Tighten to 8-13 Nm (6-9 Lb-Ft) F — Tighten to 40-55 Nm (30-41 Lb-Ft) G — Tighten to 16-20 Nm (12-15 Lb-Ft) H — Tighten to 20-30 Nm (15-22 Lb-Ft) I — Tighten to 8-10 Nm (6-8 Lb-Ft) J — Tighten to 8-11 Nm (6-9 Lb-Ft) K — Tighten to 23-30 Nm (17-22 Lb-Ft) L — Tighten to 20-40 Nm (15-30 Lb-Ft) M — Tighten to 4.5-7 Nm (3-5 Lb-Ft) N — Tighten to 18-26 Nm (13-19 Lb-Ft)

change the exhaust manifold gasket,are the doughnut on the exhaust