Spokes Posted February 18, 2009 Posted February 18, 2009 my truck is a little hard to start, it has to crank for a little than fires and revs up. our 91 cherokee had the same problem, we changed the fuel pump and now starts in 1 sec. could my luck be so good wit my comanche? its a 4.0l BTW thanks!
kar120c Posted February 18, 2009 Posted February 18, 2009 Best way to tell is check the pressure with a gauge. Pump, injectors or fuel filter would be my guess. Injectors could be really dirty, had mine cleaned a few months ago (135,000 mi) by Witchhunter performance. Before I did it took 2-3 seconds of cranking, now I just bump the ignition and it starts like the day I bought it. Gained 1 mpg and got a smoother running engine. http://www.witchhunter.com/
BLHTAZ Posted February 18, 2009 Posted February 18, 2009 The MJ will NEVER fire up that quickly. The Renix controlled engine will always take between 2-5 seconds to ignite and run. I have two Jeeps with 4.0L engines...one Renix & one HO. The HO fires and is running in 1 second or less most all the time, but the MJ has never done better than 2-3 seconds. Check your fuel pressure to be sure, but there is not likely a problem...it is what it is. Don't waste your time & money cleaning the stock injectors. You can get the Ford Motorsport repalcement injectors like I used and see great improvements in idle, MPG, smoothness etc, etc... I got a 14% increase in MPG and I think it starts a little faster, but still never better than 2 seconds ;) . Go to Precision Auto Injectors for the ones that will make a difference. :thumbsup: OH...BTW...we have a special deal with Precision too if you decide to go that way. Use ' JEEP ' as a discount code at checkout and get 10% off :clapping:
Eagle Posted February 19, 2009 Posted February 19, 2009 The MJ will NEVER fire up that quickly. The Renix controlled engine will always take between 2-5 seconds to ignite and run. I have two Jeeps with 4.0L engines...one Renix & one HO. The HO fires and is running in 1 second or less most all the time, but the MJ has never done better than 2-3 seconds. +1 what TAZ said. You can't compare starting time on a Renix engine against an HO.
mvusse Posted February 19, 2009 Posted February 19, 2009 Unlike the HO the Renix control system doesn't store any information. Each start is a reboot from scratch and it takes a few cranks for it to run through diagnostics.
Spokes Posted February 19, 2009 Author Posted February 19, 2009 our 91 cherokee 4.0 starts really easy.... well at least now my truck has a real exhuast on it. i went to go out this morning and the exhuast fell off lol so now its got a brand new exhuast! its so weird riding in a quite truck.
BLHTAZ Posted February 19, 2009 Posted February 19, 2009 our 91 cherokee 4.0 starts really easy...Exactly...it's an HO ;)
Spokes Posted February 20, 2009 Author Posted February 20, 2009 our 91 cherokee 4.0 starts really easy...Exactly...it's an HO ;) ahh... good point lol :doh: there was no smilie of him putting his foot in his mouth. my dad and i were actually talking about switching out the motors in the 91 cherokee and my MJ and i would use the cherokee as a DD to keep miles down on the comanche. still don't know bout that one yet.
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now