L98 engine hesitating
#1
Intermediate
Thread Starter
L98 engine hesitating
I replaced fuel pump, fuel filter, plugs, plug wires, coil, and battery. Still has hesitation. I give up. Taking to mechanic next week. I guessing fuel injectors. Your thoughts? Car has 71,000 miles. I have had everything serviced. Fuel cleaning, radiator flush, etc. pulling my hair out. Thanks in advance
#2
Pro
Check the fuel pressure regulator located underneath and at the rear of the plenum between the fuel injector rails. Easy to rebuild. Do you still have the OEM injectors? Post some pics if your not sure.
The following users liked this post:
Paul Setterholm (06-06-2018)
The following users liked this post:
Paul Setterholm (06-06-2018)
The following users liked this post:
Paul Setterholm (06-06-2018)
#5
Team Owner
I replaced fuel pump, fuel filter, plugs, plug wires, coil, and battery. Still has hesitation. I give up. Taking to mechanic next week. I guessing fuel injectors. Your thoughts? Car has 71,000 miles. I have had everything serviced. Fuel cleaning, radiator flush, etc. pulling my hair out. Thanks in advance
#6
Intermediate
Thread Starter
Fuel injectors are original. Only modifications are exhaust and air box modified with k&n. I replaced coil to stock. It was a hypertech. I’ve had this car 2 years. It’s an 86 z51. It only had 61k miles when I bought it. Thanks for the replies everyone
#7
Team Owner
Which one in the picture do you have?
#8
Intermediate
Thread Starter
I'm not sure how the radiator flush has anything to do with hesitation. Fuel cleaning? Anything else fuel or spark related snake oils? Have you checked the spark and it's quality? Plug wires? Fuel pressure? Have you turned it to run and seen what pressure it gets to? Do not crank. Turn off and see how fast it bleeds down. Do you have Multec injectors? The cleaning can damage the injectors because the coils are fuel cooled. What mods have you done?Which injector do you have?
#9
Team Owner
If you have multecs, the snake oil could hurt the injector coils since they were designed to be fuel cooled Hence the question about which one you have
#11
Team Owner
Doesn't matter since some factory original ones are multec crap. Take a look at the injectors and see which ones you have.
Either way they are probably having build up so it might be a decent idea to just get a set of Bosch 3 reman units from FIC
Either way they are probably having build up so it might be a decent idea to just get a set of Bosch 3 reman units from FIC
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Paul Setterholm (06-06-2018)
#13
Pro