98Tahoe crank no start... sometimes

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

OP
OP
C

CaseyA

TYF Newbie
Joined
Nov 21, 2023
Posts
6
Reaction score
5
Your fuel pressure is low. Is that key on eng off? Running idle? Running highway steady state? My experience on this vintage is 60# min.
That was key on engine off. I'll have to check it now that it's running again.
 

Eman85

Full Access Member
Joined
Apr 18, 2021
Posts
349
Reaction score
504
I'll try again. When it doesn't start you say it turns over OK. If that is the case then why the jumper box and the battery charger? As someone related fuel pressure seems low.
When it won't start cycle the key off and on multiple times, not cranking just off and on, and listen to hear the fuel pump cycle. The after doing that try and start it. If it starts it is most likely the fuel pump.
As in my first response if it cranks but won't start turn the key off and then to the on position and watch the security light to be sure it shuts off.
 

muncie21

Full Access Member
Joined
Sep 25, 2010
Posts
146
Reaction score
66
If you've confirmed fuel pressure and theft system aren't culprits, look into the ignition system. When mine was doing this (years ago) I narrowed it down to the PCM or a component (don't recall the name) in the ignition system. Ended up selling it (with full disclosure of the history) before I was able to confirm what I did actually fixed the issue.
 
OP
OP
C

CaseyA

TYF Newbie
Joined
Nov 21, 2023
Posts
6
Reaction score
5
I let it sit a week and I have another no start situation. I haven't changed out any parts but I wanted to report that I checked the fuel pressure now that it's no start. With key on engine off its still 55-57psi but when cranking it goes to around 63psi.
 

exp500

Full Access Member
Joined
May 14, 2017
Posts
1,766
Reaction score
1,594
Try key to run 2 seconds, OFF, repeat 2-3 times then START. Usually 2 cycles works. Once running, recheck fuel pressures including driving.
A weak fuel pump will not keep up on highway. Change fuel filters yearly at a minimum.
Sitting a week is the Max for these trucks 4 days normal. Due to battery drain. Some a little better some worse.
 
OP
OP
C

CaseyA

TYF Newbie
Joined
Nov 21, 2023
Posts
6
Reaction score
5
Just wanted to update everyone. I believe it was the distributor cap and moisture. Seems like it wouldn't start only after it rained and only would start after a week or more to dry out. I finally pulled the cap and rotor and they were very corroded. Replaced and it seems to be running great again. Wasn't a fuel issue... Thanks for the suggestions/help.
 

exp500

Full Access Member
Joined
May 14, 2017
Posts
1,766
Reaction score
1,594
Set your scanner to monitor misfires, fuel trims, trans slip, and anything you see available. Watch it at steady state at various speeds. Say 35/45/55/65/75. Not knowing capabitities of your scanner.

Also start at the beginning and re-read the posts here. We can only suggest based on the info you provide. My next guess will be at speed your fuel trims will max out due to low fuel pressure.
 

Forum statistics

Threads
128,279
Posts
1,796,863
Members
91,028
Latest member
Gbeanos
Top