I have 00 F150 H.D. edition, have msd coils with fairly new plugs, K&N cold air intake, ported and polished upper aluminum intake, gasket matched lower intake and smoothed out intake ports on the heads as far as I could without removing them, and ported and polished the T.B. Have pacesetter long tube headers, magna-flow hi-flow converters, 2.5" exhaust going into DI/DO magna-flow 'x' pipe muffler. Still have stock gears. My concern is... now that I've opened up intake and exhaust, at 3/4 - full throttle I get a very strong burning smell from converters, it goes away after I've let up from throttle. Am I running too lean? Check engine light is not on but I don't want to burn the valves or pistons. Should I be looking at new injectors or a tune? I have limited funds so looking for best solution to get me through summer. I can keep driving at half throttle until resolved, but I want to choose wisely as injectors and a program are both expensive and I'll be doing one at a time.

 

Hello.

Wellsir - the below is just my humble opinion ...

It's very possible - 3/4 to full throttle is the point at which you go Open Loop and running off PCM fuel tables and the MAF Transfer function. If they are no longer accurate, you could be causing damage.

You need to determine your EGT's - this will tell you right away if your exhaust temps are elevated - a direct result of leaning out @ WOT.

If you have a good dyno shop nearby you cold also get yer A/F's plotted to see if they are safe (either rich or lean)

Read this post from Mr. Kaboom w.r.t long-tubes: https://www.f150online.com/forums/4153665-post20.html

I would seek out a competent Custom tuner and get this addressed ASAP.

~$400-$500 versus possible engine damage - well, you do the math

Non-boosted, right? Your stock injectors are fine.

Also - PM member 'Tarajerame' for excellent advice.

Good luck.

MGD v5.0

 

Thanks for your quick reply, I was going to buy injectors first so you saved me alot of $$. I am non-boosted for now so at least I know which way to go next. There is a business right down the road that has a dyno and quoted me $500 for a tune, but I think that is them selling me an edge or something of the sort with it. I'm hoping after tuning is done, I'd like to add e-fans and having 4:10 gears installed. Maybe by next year I'll be ready to get better cams Boosting is last on my list, I'm really enjoying doing a mod and feeling it improve every time.

 

$500 for a dyno tune w/ the programmer is a pretty good deal. Most custom tunes done over the internet or phone w/ a programmer are around $400.

Make sure that they will give you support when you add additional mods!

 

just a quick question, if my truck was leaning out what would the exhaust gas temp do?? go up or down. right now mine runs around 200-206 degrees F with only a K&N cold air intake. I have a edge evo but i have only ran it in level 1 tranny mode. just wondering and thanx for listening!

 

Your EGT would go up (hence the risk of burning valves and pistons).

I'm not sure what 'normal' should be for the 2008s. Sorry.

 

Hello.

You really should start a new thread for this, sir ( too late now, lol).

How are you measuring this? Your reading is far too low to be of any value.

The proper way is with an EGT pyrometer. It's placement is crucial - ideally inserted into the hottest cylinder's exhaust stream, but usually gets placed downstream in the collector vicinity.

An approximation can be made for comparison purposes (before/after) with a Scanguage with the relevant X-Guage configured - catalyst temps:



This isn't anywhere as accurate as a pyrometer but can help in checking whether any mods impact same from a stock baseline reading.


MGD v5.0

 

MGDfan, you constantly come through with all your crazy awesome info

 

Whoa!! you guys gotta bring it down alittle as i went to public school!! i thank you for all your information, you guys never cease to amaze me. I am just getting my reading off from my edge evo monitoring the exhaust gas out temp. But if i see a huge jump in temp and my truck runs like crap i would belive it was running lean, any comments on this. again thank-you

 

We never let egt's hit much more than 1550F on dyno runs but I would rather see less than that to around 1200-1400F at the most. Lean mixtures and/or retarded timing(allows fuel to burn outside the cylinder) are the main culprits.