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I have a new fuel pump and there is no fuel to the engine
Hello and thank you for contacting YourMechanic. A plugged-up fuel filter will cause an engine not not start. Get a fuel pressure tester and hook it up to the fuel rail. There should be a shrader valve on the fuel...
What all transmissions are interchangeable with my vehicle
Hello. It really depends on which rear end that you have and if the vehicle is four-wheel drive. If it is four-wheel drive then the differential gearing has to be the same in the front and the rear so you...
Why does my '90 Chevy C1500 turn over but not start? I'm getting fuel and a spark.
Assuming the spark is adequate and fuel pressure is within specifications, an extremely worn out set of spark plugs may be the culprit. It could be a restricted exhaust system (i.e. a plugged catalytic converter) if you had a lack...
What value should the MAF signal be at idle?
Here is a breakdown of the wiring color codes, and the associated voltages on each, for engine running and ignition on. The signal from the mass airflow sensor should steadily sweep from 1.9 to 5 volts as you press and...
Car starts but won't when warm - 1990 Pontiac Firebird
First order of business is to check for any diagnostic codes. This will make diagnosis faster and less expensive. Even though this model is pre-OBD II, there are on-board diagnostics. Both ignition and starter components can be heat-affected, but fuel...
Truck won't start unless I remove the fuel pump relay
Hey there. This is a sign of a failing fuel pump or potentially a faulty power connection to the fuel pump. As you know, if the fuel pump fails to supply adequate fuel pressure to the motor, this will cause...
My 1990 Toyota pick up 4WD will not run
Hi there. You've got some work cut out for you. It sounds like either the timing chain could be out of time or the distributor is not timed correctly. First, set cylinder 1 to top dead center and remove...
Loud engine noise
Hi, thanks for writing in. I would recommend having a smoke test performed on your vehicle. A smoke test will be able to show you where any vacuum or exhaust leaks may exist. I would recommend having the smoke test...
I just got my car today as used and have a few problems or more likely small things that could be fixed easy.
Hi. Yes these are simple problems that can be fixed. The battery light could be on for a bad battery or the alternator not charging properly. This problem can be easily determined with a battery and charging system check. Your...
My car is losing coolant from tailpipe
Hi there. According to what you've described, it does sound like your mechanic was correct; a blown head gasket. The radiator reservoir leak may have lead to the blown head gasket by causing a low coolant level, thus resulting in...
How do i fix the timing on my car?
There are several ways to check and set the ignition timing. The most traditional method is to check timing with a timing light against the recommendations of Nissan for your 1990 240SX. However, there could be issues with timing due...
Underpowered and shaking under load
Hi there. This may suggest a fuel delivery problem such as bad or dirty fuel injectors or potentially a faulty O2 sensor. As you may know, the oxygen sensors which are part of your emissions system read exhaust gases to...
Does it have a crankshaft piston sensor
There is a technical bulletin, TSB 89-24-9, for a hard start after a short heat soak. The engine control module does not control ignition timing correctly when hot and thermostat lets engine get too hot. The recommendation would be to...
Adjusting the camshaft and crankshaft for the timing chain
I believe the "official" procedure for these M30 engines is to: Leave the tensioner until last Install the chain with the crank and cam sprockets on TDC, and the chain tight on the driver side of the chain Use...
Car deck
Hi, thank you for writing in. I am assuming you are talking about the radio. When installing a new radio, it really depends on what brand/type of radio you will putting in. A lot of manufacturers will have a plug...
Throttle body problems
Hello. You need to hold the throttle body open and put the cleaner on a rag and rub inside the throttle body top and bottom where plate contacts and then clean the edges of the throttle plate. If after cleaning...
Car will start but won't idle
This may be a sign of a failing idle air control valve. The idle air control valve is located on or near your intake manifold that monitors the air intake as it is mixed with fuel prior to being injected...
Car keeps dying
There are usually two different issues that cause the engine to stall or reduce RPM in situations like this. The first thing I'd look at is the idle control valve or sensors that monitor the fuel system. The second item...
Randomly shuts off no matter how much fuel is in vehicle, no acceleration/stalling when pushing pedal.
Hello and thank you for writing in! When was the last time you changed the fuel filter? The filter can have a huge effect on how much fuel is delivered to the engine. With the age of your vehicle, there...
Won't restart after its been driven across town.
These symptoms are evidence of "heat soak" electronic failure - most likely the starter solenoid. The solenoid has an electrical fault that heat exaggerates. After being parked for a short period of time - 10-15 minutes, the solenoid absorbs enough...

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