Engine/Transmission (1998.5 - 2002) JEEZE, another P0237...

[Gary - K7GLD]

A short while back, I started getting P0237 codes, so replaced the MAP sensor, and all has been well since - until today, when again, at an engine idle, I got another CES light and the P0237.



While it's possible the second MAP has failed, it seems sorta unlikely - and I'll check connections tomorrow if weather stays decent.



BUT, I'm beginning to wonder if it's possible that the Edge Comp boost fooler circuit might be causing the problem code, and not the MAP itself?



Any comments?

 

[NoSeeUm]

You tried checking its "Anatomy"?



LOL



Sorry, good luck with your problem. I have zero clues.



Jim

 

[PRout]

BUT, I'm beginning to wonder if it's possible that the Edge Comp boost fooler circuit might be causing the problem code, and not the MAP itself?

Any comments?

Gary, about 6 months ago I experienced the same thing. The MAP code would come on with a cel. Would clear the code and then within a minute after restarting the truck, the problem would return. Replaced the map sensor, cleared the code, fired it up, code reappeared.

Then I removed the boost fooler for the APB fueling box. Problem gone.

I have since been running that box without its boost sensor connected. The problem has not come back. The APB just adds fuel quicker when turning the box on/up. Since that time I have added the edge ttpm's boost fooler inline without issue.

I suspect you may be correct on your theory.

 

[ROADWARRIOR]

Make sure your MAP harness for the Edge box doesn't have corrosion in the plug end. I had that happen and I tried to get all the green off the plug, it didn't help. Edge gave me a new harness and the problem was solved. This corrosion happened with the plug greased.



Dan

 

[Gary - K7GLD]

Make sure your MAP harness for the Edge box doesn't have corrosion in the plug end. I had that happen and I tried to get all the green off the plug, it didn't help. Edge gave me a new harness and the problem was solved. This corrosion happened with the plug greased.



Dan

My Comp has been installed for quite a while now, and no doubt could use close inspection, which I'll do later today. I'm also wondering if the heavy intake grid heater current draw at engine startup could be pulling system voltage low enough to trigger the ECM MAP sensor circuit to the low side. I'll be installing one of Stefan Kondolay's stainless intakes, with the grid heater delete - so the grid heaters won't be an issue, and will see what effect that has on MAP codes.

 

[CumminsAholic]

I second the corrosion. I had the same problem with my truck. I checked the connections and they looked good. Long story short, I checked them again, but used a flash light so I could see better, and there was corrosion on a connection between the map and a boost fooler. I couldn't see it without the flashlight, it was only 1 pin. I used electrical contact cleaner and some dielectric grease and haven't had a problem since.

Corey

 

[Gary - K7GLD]

Well, yesterday, I took all the MAP/Comp connections apart, checked them all - they looked great - and put it all abck together after applying contact cleaner/lube. I removed the power cables to the grid heaters in prep for the grid-delete performance intake on it's way from Stefan Kondolay, and had already erased the 237 code.



Now it's just "wait and see"...

 

[Gary - K7GLD]

Well, after pulling out the intake grid heaters, and carefully checking all the MAP connections, got yet another P0237...



SO, pulled the MAP, and installed another good one in it's place - if it delivers up a code, will have to assume the Comp is acting up, and see what I can do about it...



This all is only a minor nuisance, the truck continues to run great, and I wouldn't even know there was a problem, if the CES light wasn't lit...

 

[Gary - K7GLD]

WELL, as a followup - the 237 showed up with the good replacement MAP sensor, so I am pretty convinced the actual problem related to the Comp's boost-fooling circuit. So, I again cleaned all connections, and also pulled the Comp controller out and cleaned it's connector contacts - reinstalled the MAP sensor that all this started with, and after a couple weeks driving, no more 237's.



Keeping my fingers crossed...

 

[darkhorse]

WELL, as a followup - the 237 showed up with the good replacement MAP sensor,



I wired up my APB for the first time last week & funny thing... . a P0237. Glad I found this thread with the search. I guess I'll be polishing contacts soon.

 

[PRout]

WELL, as a followup - the 237 showed up with the good replacement MAP sensor,

I wired up my APB for the first time last week & funny thing... . a P0237. Glad I found this thread with the search. I guess I'll be polishing contacts soon.

Hmmm, good points, maybe just a poor connection. . Darkhorse, actually, I'm kinda liking my APB without the green wire connected, and using the edge as the boost fooler. The throttle response is adjustable "with the knob" (gotta love that feature)

 

[PRout]

FYI - When mine messed up, I also lost most power off the bottom, like the MAP wasnt able to tell the ECM to start fueling, so it sounds like our symptoms are a little different. But still, it does sound like either a poor connection in the map ckt somewhere, boost module changing in values, or possible "Poor Ground" on the negative wire that runs opposite of the Comp/APB tap wire?? (doubt the last one though).

Another observation was this happened when I had a Smarty programmer available. With just stock software, I had lost my low end fueling when the map ckt was acting up. Was very difficult to drive. Went to a catcher software (#5) and it ran fine off the bottom (ran normally actually). Like the ECM was no longer waiting or caring for enough boost signal from the MAP sensor before adding fuel. It was a handy workaround until I found the problem.

 

[darkhorse]

maybe just a poor connection. . Darkhorse, actually, I'm kinda liking my APB without the green wire connected, and using the edge as the boost fooler. The throttle response is adjustable "with the knob" (gotta love that feature) [/QUOTE]



The pins looked clean as could be & I got no stain on the Q tip I used to wipe them down. Never the less when I plugged it all together & ran it, no codes. I have to push it a little hard to turn on the APB but when I do, ... . whooosh . Any way, thanks Gary , for starting this thread. Now I'm going to have to try unplugging my little green wire. Smarty is my boost fooler.

 

[PRout]

Any way, thanks Gary , for starting this thread. Now I'm going to have to try unplugging my little green wire. Smarty is my boost fooler.

Whew! With 3. 8's, the programmer, & APB without the green wire, that will no doubt make a good "James Bond type" getaway vehicle. . Now all you need is an oil slick & some rearward pointing missile launchers to fire through the smokescreen. . :-laf

Added: Let me know how you like it without the green wire. . Actually, it might be a little too much fuel down low for your setup, but with these little 275 inj's it works great.

 

[darkhorse]

Added: Let me know how you like it without the green wire. . Actually, it might be a little too much fuel down low for your setup, but with these little 275 inj's it works great. [/QUOTE]



I haven't unplugged the green wire yet but more driving & still no CEL.

 

[Gary - K7GLD]

Added: Let me know how you like it without the green wire. . Actually, it might be a little too much fuel down low for your setup, but with these little 275 inj's it works great.



I haven't unplugged the green wire yet but more driving & still no CEL.

Mine's been fine too - still no more 237's, Comp working great - big RV trip starts Tuesday - acid test for the MAP, as well as the new SS intake...

 

[PRout]

Hope you have a great trip Gary. . (Makes me wanna put up a quick inverted v to yack with ya on 40. . ) gotta work though.

I just removed the TTPM (was using it's boost fooler), put the 'ol Practical Solutions in there in "stealth mode" (hidden at the back of the motor). Used dielectric grease in the connectors after cleaning them out well. No MAP problems either. Next thing to come out will probably be the APB box after putting in some M2's. Might try cleaning its boost fooler connectors one last time and giving it a last whirl to see if that fixes the previous problem when it was connected before (just for grins & giggles). If it acts up, I'll send it (the map adaptor only) back to Chip and work a deal for a new one so I can sell the unit.

One thing I can see right off though is without the added timing of the edge box, average EGT's have come up maybe 50+ degrees under normal driving. That added timing is hard to give up. .

Wish someone made a "stealth" (adjustable timing box only).

Again, Have FUN! & good luck with the P0237. . & that thing of beauty intake... (Im headed north on the 31st - Got Zeke's gold bait??)

 

[darkhorse]

Mine's been fine too - still no more 237's, Comp working great - big RV trip starts Tuesday - acid test for the MAP, as well as the new SS intake...

I unplugged the green wire. I didn't I didn't get a block & the CEL was back on. ... . guess mine needs the boost fooler.



Gary, I've got a case of intake envy. :-laf Seriously, Stefan has made the best looking air horn yet.

 

[PRout]

Interesting. . My green wire is disconnected. APB boost harness is out of line and put away in the truck parts bin. Have used 2 different Boost Foolers with NO codes. . The APB fuels hard right off idle if you turn it up. Still no code. Gonna have to think about that one. .

 

[Gary - K7GLD]

(Im headed north on the 31st - Got Zeke's gold bait??)

IF they still sell them at the marina store at upper Twin, trolling with the purple woolly-buggers was the hot setup when we were there last, especially just off-shore from the marina - good luck...