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Ask GM Tech (Cam) Your Own Question

GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 27667
Experience:  GM Grand Master Technician 2007. 11 years experience.
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I have a 98 chevy s10 pickup with a 2.2l engine that wont fire

Customer Question

I have a 98 chevy s10 pickup with a 2.2l engine that wont fire how can I check to see if it has jumped time?
Submitted: 4 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 4 years ago.
Chat Conversation Started
GM Tech (Cam) :

Greetings and Welcome to Just answer.

GM Tech (Cam) :

I will do my best to assist you. When you are finished please click on accept only if you are satisfied. I don't get paid unless you do.Please do not accept if you cannot leave positive feedback. I don't know if you are a tech or a just working on your own vehicle so we may have to fine tune the answer. I only know as much about your problem as you have told me in your post, so my answers will be based on what you tell me so please add all the details you can.

Customer :

so how can I check to see if it has jumped time how do I check it I cant get to the distributore

Customer :

if it has jumped time will I get a code on the trucks computore?

GM Tech (Cam) :

These don't use a distributor, they use a coil pack system.

Customer :

what is that

GM Tech (Cam) :

Try this first, does it try to start or stumble if you put a bittt of fuel directly into the throttle body?

Customer :

yes

GM Tech (Cam) :

OK, then that is not ignition, that is fuel. What is your fuel pressure?

Customer :

no idea I replaced the fuel filter is there something else I can check?

Customer :

could it be the fuel pressure sensore curcuit

GM Tech (Cam) :

Yes the fuel pressure. First, see if the fuel pump runs.

GM Tech (Cam) :

There is no fuel pressure sensor.

Customer :

how do I check that

GM Tech (Cam) :

See if you can hear the fuel pump when you first turn the key on, it shoudl run 2 seconds.

Customer :

yes I hear it

GM Tech (Cam) :

Did the sound change at all?

Customer :

no

GM Tech (Cam) :

Ok, test the pressure and see. Also see if there is spark at the any of the spark plugs.

Customer :

we have spark how do I check the pressure

GM Tech (Cam) :

You will need a fuel pressure gauge and the adapter hose to install into the system.

Customer :

we dont have one is there any other way. Aslo this truck has 170000 miles and the original timing belt could it have jumped time and how do I check that?

GM Tech (Cam) :

I doubt the timing at the moment and it is a chain not a belt.

Customer :

is there any other way to check the fuel pressure

GM Tech (Cam) :

No, it must be done with a gauge.

Customer :

if its low what do I do

GM Tech (Cam) :

Replace the fuel pump.

Customer :

where is it locaTED

GM Tech (Cam) :

In the fuel tank

Customer :

my computer shows a code of PO 452 what is that

GM Tech (Cam) :

That is the EVAP sensor on the top of the fuel tank, not part of the fuel supply system, but of the emissions.

Customer :

whould that be the problem

GM Tech (Cam) :

No, because the pressure sensor is only for the evaprative emissions, the fuel vapors. It has nothing to do with the operation of the fuel pump. YOu can unplug that and all you would get is a code. tHe engine will still run fine.

Customer :

we unhooked the fuel line at the filter and its pumping fuel fine

Customer :

would a code of po 420 affect it

GM Tech (Cam) :

No that is a code for a bad converter. Even though fuel is coming out, can the pump give the proper pressure. 41-47 psi?

Customer :

it shot fuel clean across the drive way'

GM Tech (Cam) :

Forgive me, but we need the actutal pressure. 20 psi will shoot across the drive way.

Customer :

ok let me check it out

GM Tech (Cam) :

Please do.

Customer :

ok the pressure is at 38

Customer :

its starts at 41 for a few secounds than drops to 38

GM Tech (Cam) :

Ok,

GM Tech (Cam) :

Did it drop off past 38 after a few mins?

Customer :

no

GM Tech (Cam) :

ok, is the security light flashing?

Customer :

but there doesnt seem to be any fuel in the carb when we try to start it

GM Tech (Cam) :

IF security is active, it will not allow the injectors to run

Customer :

it doesnt flash but it come on after a few secounds

GM Tech (Cam) :

does the check engine light remain on when cranking?

Customer :

yes

GM Tech (Cam) :

Ok, do you have any sort of scan tool/

Customer :

for the computer

Customer :

just one that checks the codes that I gave you earlier

GM Tech (Cam) :

OK, so a code reader?

Customer :

yep

GM Tech (Cam) :

Ok, we will need to see a real scan tool to see if the computer is stopping the injectors for some reason. It could even be the ignition module causing this.

Customer :

can I bypass it some how

GM Tech (Cam) :

No, that is the problem. however most part stores can test the igntion module for free.

Customer :

do I haveto take the vehical to them

Customer :

or can I remove the ignition module and take it to them

GM Tech (Cam) :

No you can take the module off. It is under the coil packs in the passengers side of the engien?

GM Tech (Cam) :

engine.

Customer :

the coil pack is what the spark plug wires go into instead of a distributor cap right

Customer :

and what does it look like

GM Tech (Cam) :

yes

GM Tech (Cam) :

Is is flat and the coils attach to it with screws.

GM Tech (Cam) :

There are a couple connectors on each side.

Customer :

how do I get to it from under neith

GM Tech (Cam) :

yes that is the easiest. The bolts should be a 5.5mm./

Customer :

ok I found it and some place that can test it if its bad and i replace it will that get it to start?

Customer :

ok I found it and a place to test it if its bad and I replace it will it start? if its not bad whar else could it be?

GM Tech (Cam) :

OK, get it tested and see.

GM Tech (Cam) :

Possibly a bad wire or something in the PCM. I am trying to suggest parts to test that done need a scan tool or shop, but it may end up as that.

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GM Tech (Cam)
GM Tech (Cam)
14180 Satisfied Customers
GM Grand Master Technician 2007. 11 years experience.